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.

Gnomish

-thwi

suffix. -thwi

fwi-

prefix. fem. patronymic prefix

A “fem. patronymic prefix” in the Gnomish Lexicon of the 1910s, with a suffixal form -thwi (GL/36), probably meaning “✱daughter of” given its comparison to G. suil “daughter” (GL/68) and probably derived from the early root ᴱ√SUẈU (QL/87).

Gnomish [GL/36; GL/68] Group: Eldamo. Published by

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.