Gnomish
curth
noun. curd
curtha-
verb. to curdle, to make cheese (tr.)
cur-
verb. to turn sour, curdle, congeal
curus
noun. witch
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!
A noun appearing as G. curth “curd” in the Gnomish Lexicon of the 1910s related to the verb G. cur- “curdle” (GL/28).
Neo-Sindarin: I would adapt this noun as ᴺS. corth “curd” from ᴺS. cor- “curdle” for purposes of Neo-Sindarin, with short u becoming o as was generally the case in Sindarin.