Gnomish
mast
noun. feed, food, nourishment; fodder
bast
noun. bread
delmos
noun. beech nuts, mast [= fruit of beech, oak, chestnut]
There are more words but they are from Tolkien's earlier conceptional periods. Tolkien likely changed these words as he evolved the aesthetics and completeness of the languages. You may even find languages that Tolkien later rejected. Do not mix words from different time periods unless you are familiar with the phonetic developments.
Below: Tolkien's Late Period (1950–1973). These are from Tolkien's late conceptual period — his most settled forms of the languages. Prefer these over the earlier ones above when composing new text.
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.