Roots are the content words of draqa. They describe "events". An event is any given manifestation of a thing. Sika "Greenness" would be an event, as would skae "Running" or zwehla "Tree" also be events. These concepts are divided into three categories, or genders. Sika "Greenness" would fall into the abstract gender, and so would skae "Running". Zwehla "Tree" would fall into the inanimate gender. Beas "Mother" would fall into the animate gender.
The animate gender usually consists of people, animals, spirits and certain natural phenomenon that contain movement (e.g. fwi Wind, Air, Breath).
The inanimate gender usually consists of other concrete objects, which usually don't move on their own.
The abstract gender consists of concepts that can't be actually contained or touched. This would include actions, feelings, states, attributes, etc.
Particles are words that words that indicate something about a word or phrase. Many serve grammatical functions. There are also several Particles that serve chiefly to modify Roots. Many of these can be found as Roots themselves. You've already run into some Particles on the Introducing Sentences page. Those Speech Act, Evidence and Reality morphemes were unbound particles. One of those, sehi- Not can also be found as a bound particle. Although the meanings for the bound sehi- and the unbound sehi are clearly similar, the two are not considered the same "word".
An unbound particle is a Particle that can stand on its own. It is a "word" by itself. Most of these are "grammar words" in draqa.
A bound particle is a Particle that must be used to modify another word, usually a Root. It is found connected, or affixed, to the word it modifies, and cannot stand alone. Some of these perform grammatical functions. Many, however, perform semantic and other functions.