Gnomish
gioth
noun. germ, foetus, embryon
giwth
noun. germ, foetus, embryon
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 noun appearing as G. gioth or giwth “germ, foetus, embryon” in the Gnomish Lexicon of the 1910s derived from the early root ᴱ√giu̯i [GIWI] which was the basis for a number of words having to do with pregnancy (GL/39), where iu to io as usual in Gnomish.
Neo-Sindarin: I would adapt this word into Neo-Sindarin as ᴺS. gŷth, using the later sound change whereby iu > ȳ.