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.
yo
conjunction. and
yondo
noun. son
sinome nimaruva, yo hildinyar tenn’ ambar-metta
Here will I abide, and my heirs, unto the ending of the world
me·mittanelme i·mbarenna yo sasse né túro
we got into the house and there was Túro
ko
adverb. reflexive
ye
conjunction. and
yu
conjunction. and
óma
noun. voice
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.