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
fafli
noun.bladder
A noun appearing as G. fafli “a bladder” in the Gnomish Lexicon of the 1910s, an elaboration of G. faf- “puff, blow” (GL/33).
Neo-Sindarin: I would adapt this word as ᴺS. faul “bladder” from ᴺS. faw- “puff, blow”, likely with the original sense “inflated thing”. This mirrors the etymology of English “bladder”, which is also derived from an ancient verb meaning “to blow”.
A noun appearing as G. fafli “a bladder” in the Gnomish Lexicon of the 1910s, an elaboration of G. faf- “puff, blow” (GL/33).
Neo-Sindarin: I would adapt this word as ᴺS. faul “bladder” from ᴺS. faw- “puff, blow”, likely with the original sense “inflated thing”. This mirrors the etymology of English “bladder”, which is also derived from an ancient verb meaning “to blow”.