Gnomish
caf-
verb. to taste (used of the thing)
caf
noun. blade
cim
noun. blade
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!
An (archaic) noun appearing as G. †cim “blade” in the Gnomish Lexicon of the 1910s (GL/26). The noun G. caf “blade” also appeared in the same document, but it was deleted (GL/24).
Neo-Sindarin: The root √KIM “edge, brink of” appeared in Tolkien’s writing of the 1960s, with derivatives like Q. címa “edge of a cutting weapon/tool” (PE22/149). Therefore, I think this Gnomish noun might be retained for purposes of Neo-Sindarin as ᴺS. cim “blade”, perhaps derived from primitive ✱kimbē. I would also assume this Neo-Sindarin word was not archaic.