Gnomish
bess
noun. wife
bessin moron
good wives
bess mora
a good wife
bedhril
noun. wife
bast
noun. bread
nîr
noun. woman
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 (archaic) G. †bedhril “wife” in the Gnomish Lexicon of the 1910s, replaced in ordinary speech by G. bess (GL/22). It is a combination of the early root ᴱ√Beđ that was the basis for marriage words and the feminine agental suffix G. -(r)il (GL/22).
Neo-Sindarin: I would adapt this into Neo-Sindarin as ᴺS. bethril “spouse (f.)”, a combination of the later root ᴹ√BES “wed” and the same agental suffix, where sr became thr.