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.
masta-
verb. to feed, graze
bas-
verb. to bake
A verb appearing as G. bas- “bake” in the Gnomish Lexicon of the 1910s (GL/22), based on the early root ᴱ√M(B)ASA “cook, bake” (QL/59).
Neo-Sindarin: For purposes of Neo-Sindarin I would update this verb to ᴺS. basta- “to bake” for better compatibility with the later Quenya verb [ᴹQ.] masta-. I first saw this neologism suggested by Fiona Jallings (FJNS/339).
bast
noun. bread
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.
The verb G. masta- “feed, graze” appeared in the Gnomish Lexicon of the 1910s (GL/56). Its etymology is unclear; it is tempting to assume it is derived from the early root ᴱ√MATA “eat” (QL/31), but is not clear how the st would arise in the phonology of Gnomish. Another possible root is ᴱ√M(B)ASA, but in the Qenya Lexicon this root was glossed “cook, bake” (QL/59, 63).
Neo-Sindarin: This word can easily be adapted as Neo-Sindarin ᴺS. masta- based on an ancient causative verb = √MAT “eat” + ✶-tā, since t + t from suffixion resulted in st in the Elvish phonology of the 1930s-60s. I would limit this verb to the sense “[put to] feed, graze” for animals, while directly feeding another would be ᴺS. media-.