A word appearing as G. cuithos “life (period of life); living, livelihood” in the Gnomish Lexicon of the 1910s, a noun form of G. cuitha- “am alive” (GL/27).

Neo-Sindarin: For purposes of Neo-Sindarin, I’d update this word to ᴺS. cuithas using the later abstraction noun suffix -as, and would assume it is an abstraction based on ᴺS. cuith “[biological process of] life”. I would use it to refer both to the means of providing for one’s life (= “livelihood”) as well as a period of time within one’s life, as opposed to one’s entire lifetime which would be ᴺS. cuilvorn.