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.

Gnomish

duil

noun/adjective. flight, power of flight; having power of flight, fledged

A noun in the Gnomish Lexicon of the 1910s meaning “flight, power of flight”, clearly based on ᴱ✶du̯il from which G. duiling “swallow” [bird] was derived (GL/31). The word duil also functioned as an adjective meaning “having power of flight, fledged”, but there was a more proper adjective form G. duileg with these meanings as well.

Gnomish [GL/23; GL/31] Group: Eldamo. Published by

duil

noun. swallow

duilin

masculine name. Swallow

Gnomish [LBI/Duilin; LBI/Fuilin; LT2/203; LT2A/Duilin; LT2I/bo-Dhuilin; LT2I/Dhuilon; LT2I/Duilin; PE13/104; PE15/22] Group: Eldamo. Published by

duilin(g)

noun. swallow

Gnomish [GL/23; GL/31; GL/39; GL/54; LT2A/Duilin; QL/096] Group: Eldamo. Published by

duilinc

noun. swallow

tuil

noun. spring

Gnomish [GL/31; GL/47; GL/71; LT1A/Tuilérë; LT2A/Duilin] Group: Eldamo. Published by

glindwil

noun. swallow

A noun in the Gnomish Lexicon of the 1910s for the bird “swallow” with variants glindwil and lindwil, a combination of G. glin “sound” and the suffixal form -wil of G. bil bird (GL/39, 54).

Gnomish [GL/31; GL/39; GL/54] Group: Eldamo. Published by

sîr

noun. river

Gnomish [GL/67; LT1A/Sirion] 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.