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.

Qenya 

umas(se)

adverb. *somewhere

A correlative appearing in Demonstrative, Relative, and Correlative Stems (DRC) from 1948 (PE23/111), a combination of ᴹQ. uma- “some” and the locative suffix ᴹQ. -sse.

uma

some (when the identity is unknown); something or other

A singular indefinite adjective “some” in Demonstrative, Relative, and Correlative Stems (DRC) from 1948 (PE23/105), also usuable pronominally to mean “something” (PE23/105). This adjective is specifically singular, as in uma elda “some (unknown) Elf”. An indefinite plural would use the partitive plural suffix -li: eldali “some Elves”.

Neo-Quenya: In Tolkien’s later writings ma was the pronoun for “something”. However, I would retain uma for the adjective form, and also use it for a singular indefinite subject since ma might be confused with an interrogative: uma tíra me “something is watching us”, as opposed to ma tíra me which might be interpreted “what is watching us”.

Qenya [PE23/104; PE23/105; PE23/111; PE23/112] Group: Eldamo. Published by

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.