Early Quenya
kai
cardinal. ten; (lit.) all fingers
kainen
cardinal. ten
kai kuluinen Archaic
*ten pieces of gold
kai nerion Archaic
ten men
kea
cardinal. ten
lempe
cardinal. ten
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.
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.