Gnomish
mast
noun. feed, food, nourishment; fodder
bast
noun. bread
delmos
noun. beech nuts, mast [= fruit of beech, oak, chestnut]
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. mast “feed, food, nourishment; fodder” in the Gnomish Lexicon (GL/56). Its etymology is unclear; it might be derived from the early root ᴱ√MATA “eat” or from ᴱ√M(B)ASA “cook, bake”.
Neo-Sindarin: This word can easily be adapted as Neo-Sindarin ᴺS. mast based on ancient √MAT “eat” + noun suffixes ✶-dā or ✶-ta, since d + t or t + t from suffixion resulted in st in Sindarin phonology. I would limit this word to animal feed or fodder, and would use ᴺS. math for “food” in general.