There are more words but they are from Tolkien's earlier conceptional periods. Tolkien likely changed these words as he evolved the aesthetics and completeness of the languages. You may even find languages that Tolkien later rejected. Do not mix words from different time periods unless you are familiar with the phonetic developments.
-th
suffix. plural suffix
-eth
suffix. abstract noun
-ith
suffix. abstract noun
-(o)th
suffix. abstract noun
-in
suffix. plural suffix
-ios
suffix. abstract noun
-os
suffix. abstract noun
-ri
suffix. abstract noun
dairtha-
verb. to play, amuse
gar(th)
noun. place, district
maithri
noun. control
sitha
adjective. this
Below: Tolkien's Late Period (1950–1973). These are from Tolkien's late conceptual period — his most settled forms of the languages. Prefer these over the earlier ones above when composing new text.