Gnomish
telu
noun. end
telu-
verb. to close, end, finish
teld
noun. roof
dâ
adjective. high
teltha-
verb. cover in
telthon
noun. roof
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 verb in the Gnomish Lexicon of the 1910s gloss “cover in” meaning “close with a roof, lid, canopy, etc.”, based on the early root ᴱ√tel- “cover in; close; finish” (GL/70).