Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!

Gnomish

tereg

noun. worm

gwem

noun. worm

A noun appearing as G. gwem “worm” in the Gnomish Lexicon of the 1910s (GL/45), probably derived from the early root ᴱ√GWEVE that was the basis for “worm” words in the contemporaneous Qenya Lexicon (QL/103).

Neo-Sindarin: I think this word is worth retaining as (archaic?) ᴺS. gwem “worm” for purposes of Neo-Sindarin as a derivative of the Neo-Root ᴺ√WEB, though I expect the 1964 word S. leweg “worm” is more commonly used.

terch

noun. worm