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.
yanta-
verb. to add to, enlarge, increase, augment
yanta
adjective. joined
anta-
verb. to give
yanta
adjective. large
yalta
noun. yoke
yarta
noun. yoke
penda
noun. bridge
yalte
noun. yoke
úmea
adjective. large
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 word appearing as ᴱQ. ’yanta- “enlarge, increase, add to” in the Qenya Lexicon of the 1910s under the early root ᴱ√YṆTṆ (QL/106). It was also mentioned in the contemporaneous Gnomish Lexicon as a cognate to G. intha- of similar meaning (GL/37). It appeared as yantya “add (to), to augment” in the English-Qenya Dictionary of the 1920s, but those entries were marked through (PE15/68-69).
Neo-Quenya: For purposes of Neo-Quenya, I retain ᴺQ. yanta- “to add to, enlarge, increase, augment” based on a Neo-Root ᴺ√GYANTA. If you subscribe to the sound change whereby gy became ly (as I used to do in earlier versions of this lexicon), its proper form might be lyanta-.