Early Quenya
tyuku-
verb. to chew
tyukta-
verb. to chew
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.
A verb appearing as ᴱQ. tyuku- “to chew” with variant tyukta- in the Qenya Lexicon of the 1910s derived from the early root ᴱ√TYUKU of the same meaning (QL/50).
Neo-Quenya: I’d retain this verb as ᴺQ. tyuc- “chew” for purposes of Neo-Quenya, derived from the Neo-Root ᴺ√TYUK.