ja~

Well; well then; in that case; (well) now

ja mata~

See you later! (Less formal than "sayonara". Can be abbreviated to a short "ja!"; this was found online, the one below was from a dictionary, take your pick! ^_^)

ja ne~

"See you later" (said between friends)

jari~

pebble

jiclai~

era (period)

jiga~

ego

jigoku~

hell

jiguchi~

pun

jii-pan~

bluejeans, Levis

jijitsu~

fact

jikan~

time

jiki~

time; season

jiko~

accident; self

jikken~

experiment

jiku~

axis, axle

jinja~

Shinto shrine

jisatsu~

suicide

jitsuryoku~

power

jizen~

charity

jo-mae~

lock

jodan~

joke

joo~

queen

juku~

cram school

jusho~

address