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!

Gnomish

mûst

noun. byre, cowhouse

A word appearing as G. mûst “byre, cowhouse” in the Gnomish Lexicon of the 1910s, a combination of G. “ox” and ost “enclosure” (GL/58). Tolkien wrote ŭ in parenthesis after this word, perhaps indicating the proper form should be mŭst, since a long vowel before a cluster like st is very peculiar.

Neo-Sindarin: I would adapt this word as ᴺS. munnost, using the later word S. mund as its initial element.