Pronunciations

C
'k', not 's'
CH
'k', not 'ch'
DH
soft 'th' in 'then', not 'thin'
G
'get', not 'gin'
KH
At the start of a word, the 'k' sound is often dropped, except in Khuzdul (Dwarvish)
Doubled consonants are twice long e.g. Yavanna is Yav-an-na, not Yav-ana. (English 'unnamed' not 'unaimed')
AE
a-e (sometimes same as AI)
AI
'eye', not 'ay'
AU
In Sauron, 'sour' not 'sore'
E
If at the end of a word is written as ë (Elwë, pronounced 'El-way'), if in middle of word (Menegroth) pronounced as 'Men-e-groth', not 'Meen-groth'
EA
e-a (written eä or Eä)
EI
'ay' ('grey')
EO
e-o (written eö or Eö)
ER
Before a consonant or at the end of a word (e.g. Nerdanel), pronounced as 'air'
IE
i-e (Ni-en-na, not Nee-na)
IR
Before a consonant or at the end of a word (e.g. Círdan), pronounced as 'eer'
OE
o-e (sometimes same as 'toy')
Ú
'oo', thus Túrin is 'Toorin', not 'Tyoorin'
UI
'ruin'
UR
Before an consonant or the end of a word(e.g. Gurthang), pronounced as 'oor'
A circumflex accent in stressed monosyllables in Sindarin denotes the particularly long vowel in such words (e.g. Hîn Húrin is 'Hyn' not 'Hin') but in Adúnaic (Númenórean) and Khuzdul (Dwarvish) names the circumflex simply denotes long vowels (Khazad-dûm).

Elements in Quenya and Sindarin

adan
'The Second People', (plural Edain), Quenya Atan (plural Atani), Men, esp. the three houses of the Elf-Friends
adu
'double'
aelin
'lake, pool', cf. lin (1)
aew
'small bird', Quenya aiwë
aglar
'glory, brilliance', Quenya alkar, cf. root kal-, 'shine', and also alata 'radiance'
aina
'holy'
alata
'radiance', Sindarin galad, cf. kal- (gal-)
alda
'tree', Sindarin galadh
alqua
'swan', Sindarin alph, root alak-, 'rushing'
amarth
'doom', Quenya ambar
amon
'hill', plural emyn
anca
'jaws'
an(d)
'long'
andúnë
'sunset, west', Sindarin annûn, root ndu, 'down, from on high', in Quenya númen 'the way of the sunset, west', and Sindarin dûn 'west', from which Adûnaic adûn
anga
'iron', Sindarin ang, angren 'of iron', plural engrin
anna
'gift'
annon
'great door or gate', plural ennyn
ar-
'beside, outside, without'
ar(a)-
'high, royal, noble', extended to arat- in aráto 'champion'; aran 'king', plural erein or erain
arien
Maia of the Sun, root as- also in Quenya árë 'sunlight'
atar
'father'
band
'prison, duress', Quenya mando, root mbando
bar
'dwelling', Quenya már, root mbár
barad
'tower', plural beraid.
beleg
'mighty'
bragol
'sudden'
brethil
'silver birch'
brith
'gravel'
---Names beginning with C---
See entries under K
calen (galen)
'green', c.f. kal-
cam
'(cupped) hand', from kamba
carak-
Root of Quenya carca 'fang', Sindarin carch, carach 'jaws'
caran
'red', Quenya carnë
ceber
'stake', plural cebir, gebir
celeb
'silver', Quenya telep or telpë, adjective celebrin 'like silver in hue or worth'
chaint
'shapes'
collo
'cloak', Sindarin gol
coron
'mound'
'bow'
cuivië
'awakening', Sindarin echui
cul-
'golden-red'
curu
'skill'
dae
'shadow'
dagor
'battle', root ndak-, derivative Dagnir 'bane'
del
'horror', deloth 'abhorrence'
dim
'sad, gloomy'
dîn
'silent'
dol
'head', a hill or mountain
dolen
'hidden'
dôr
'land', Quenya blended with nórë 'people' to give Númen(n)órë 'people of the west', eventually Númenor 'land of the west', also Endor 'Middle-Earth', cf. ened
draug
'wolf'
'night, dimness', Quenya lómë, derived from dömë; dúlin 'nightingale', Quenya lómelindë
duin
'(long) river'
dûr
'dark'
eär
'sea', Sindarin cf. gaer
echor
'encircling, circle'
edhel
'elf', plural Edhil
eithel
'well', Quenya ehtelë, cf. kel-
êl, elen
'star', adjectives elda and elena, 'of the stars', Sindarin eledh; Eldar, 'People of the Stars', the Elves, Sindarin Edhel
ened
'middle'
er
'one, alone'
ereg
'thorn, holly'
esgal
'screen, hiding'
falas
'shore, line of surf', Quenya falassë; derivative Quenya falma '(crested) wave'
faroth
Derived from root meaning 'hunt, pursue'
faug-
'gape'
fëa
'spirit'
fin-
'hair'
formen
'north', Sindarin forn, for, forod
fuin
'gloom, darkness', Quenya huinë
gaer
'sea', said to derive from gaya 'awe, dread'
galad
'radiance', Quenya alata, cf. kal- (gal-)
gaur
'werewolf', root ngwaw- 'howl'
gil
'star', giliath 'host of stars'
girith
'shuddering'
glam
'din'
glîn
'gleam', particularly of the eyes
golodh
Sindarin form of Noldo 'the Wise', plural Golodhrim and Gelydh, cf. gûl
gond
'stone', Quenya ondo
gor
'horror, dread', also goroth with same meaning
groth (grod)
'delving, underground dwelling'
gûl
'sorcery', root ngol-, from which Quenya nólë 'long study, lore, knowledge'
gurth
'death'
gwaith
'people'
gwath, wath
'shadow, dim light, grey', also weth; shadows cast by light were morchaint 'dark shapes'
hadhod
Sindarin translation of Khazâd
haudh
'mound'
heledh
'glass', Khuzdul kheled
heru
'lord', Sindarin hîr, also híril 'lady'
him
'cool'
híni
'children'
hîth
'mist', Quenya hísië
hoth
'host, horde', mainly in an evil sense
hyarmen
'south', Sindarin har-, harn, harad
'void, abyss'
iant
'bridge'
iâth
'fence'
iaur
'old'
ilm-
Stem possibly meaning 'high airs'
ilúvë
'the whole, the all, everything'
ita-
Root meaning 'sparkle'
kal- (gal-)
'shine'; derivatives calen (galen) 'green', aglar 'glory, brilliance', galad 'radiance'
káno
'commander', shortened to gon
kel-
'go away, (of water) flow away, flow down'; from et-kelë 'issue of water, spring' was derived cf. eithel 'well'
kemen
'earth'
khelek-
'ice', Quenya helka 'icy, ice-cold'
khil-
'follow'
kir-
'cut, cleave', cf. ris
lad
'plain, valley', also imlad 'narrow valley with steep sides (canyon)'
lanthir
'waterfall'
laurë
'golden in color', Sindarin (g)lór
lhach
'leaping flame'
lin (1)
'pool, mere', cf. aelin
lin- (2)
Root meaning 'sing, make a musical sound'
lith
'ash, ashes'
lok-
'bend, loop', from which (h)lókë 'snake, serpent', Sindarin lhûg
lóm
'echo', also lam
lómë
'dusk', cf.
londë
'land-locked haven', Sindarin lond, lonn
los
'snow', Sindarin loss; also lossë 'snow, snow-white'
loth
'flower', Quenya lótë
luin
'blue'
maeg
'sharp, piercing', Quenya maika
mal-
'gold', cf. cul-
man-
'good, blessed, unmarred'
mel-
'love', derivative mellon 'friend'
men
'way'
menel
'the heavens'
mereth
'feast'
minas
'tower', root min refering to isolated or prominent things, related to Quenya minya 'first'
mîr
'jewel', Quenya mírë
mith
'grey'
mor
'dark'
moth
'dusk'
nan(d)
'valley'
nár
'fire', also náro, nor, Sindarin naur; root (a)nar, from which Anar 'sun', Sindarin Anor
naug
'dwarf', related to nogoth, plural noegyth, also nogothrim
-(n)dil
'devoted to, lover of', frequent ending of personal names
-(n)dur
similar in meaning to cf. -(n)dil
neldë
'three'
neldor
'beech'
nen
'water', also nîn 'wet'
nim
'white', Quenya ninquë, root nimf, nimp, also niphred 'pallor'
oio
'ever'
orn
'tree', plural yrn
orod
'mountain', plural ered
os(t)
'fortress'
otso
'seven', shortened to os, Sindarin odo
palan
'far and wide'
paur
'fist, hand', Quenya quárë
pel-
'go round, encircle, fence', also ephel from et-pel 'outer fence'
quen- (quet-)
'say, speak', Sindarin pedo 'speak' corresponding to quet; quetta 'word', Sindarin beth; also Quendi, Quenya, Quenta 'those that speak with voices, speech, story'
ram
'wall', Quenya ramba
ran-
'wanderer, stray'
rant
'course (of a river)'
ras
'horn', plural rais
rauko
'demon', Sindarin raug, rog
riel
'garlanded maiden', root rig- 'twine, wreathe'
ril
'brilliance', Quenya rillë, rildë
rim
'great number, host', Quenya rimbë
ring
'cold, chill'
ris
'cleave', blended with kris-, cf. kir-; rist 'cleaver'
roch
'horse', Quenya rokko, shortened to ro(h)
rom-
Stem refering to the sound of trumpets and horns
rómen
'uprising, sunrise, east', Sindarin rhûn, amrûn
rond
'dome, vaulted or arched roof'
ros
'foam, spindrift, spray'
ruin
'red flame', Quenya rúnya
rûth
'anger'
sarn
'(small) stone'
sereg
'blood', Quenya serkë
sil- (thil-)
'shine (with white or silver light)', from which Isil 'moon', Sindarin Ithil
sîr
'river', from root sir- 'flow', in middle of words often hîr
sûl
'wind'
tal (dal)
'foot, end'
talath
'flat lands, plain'
tar-
'high', Quenya tára 'lofty', feminine tári; also tarma 'pillar'
tathar
'willow', adjective tathren; Quenya tasarë, tasarion
taur
'wood, forest', Quenya taurë
tel-
'finish, end, be last'
thalion
'strong, dauntless'
thang
'oppression', Quenya sanga 'press, throng'
thar-
'athwart, across'
thaur
'abominable, abhorrent', also saur
thin(d)
'grey', Quenya sinda
thôl
'helm'
thôn
'pine-tree'
thoron
'eagle', Quenya soron
til
'point, horn'
tin-
'sparkle', also din, Quenya tinta 'cause to sparkle', tinwë 'spark'; tindómerel 'daughter of the twilight', poetic name for a nightingale, Sindarin tinúviel
tir
'watch, watch over'
tol
'isle (with sheer sides)'
tum
'valley', Quenya tumbo
tur
'power, mastery'
uial
'twilight'
ur-
'heat, be hot', related to aurë 'sunlight, day', Sindarin aur, cf. arien
val-
'power', original stem bal-
vorn
'(shining) black'
wen
'maiden', frequent ending of personal names
wing
'foam, spray'
yávë
'fruit'
This list compiled from the writings of J.R.R. Tolkien. This list is by no means complete, but is correct to the best knowledge of the author.