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.
amosgarn
noun. robin
cilobinc
noun. robin
crinthammos
noun. robin, (lit.) red-breast
cílobi
noun. robin
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 word G. amosgarn “robin” appeared in Gnomish Lexicon Slips modifying the Gnomish Lexicon of the 1910s (PE13/110), a combination of G. ammos “breast(plate)” and G. carn(in) “scarlet” and equivalent to ᴱQ. karneambar “robin, (lit.) red-breast” (QL/48).
Conceptual Development: Several similar forms appeared in the Gnomish Lexicon proper: G. {ambogrintha, amrintha >>} ammogrint “red breast” (GL/19) and G. {crinthambos >>} crinthammos “red breast, robin” (GL/27), but these words used G. crintha “rosy, pink” rather than G. carn(in) “scarlet”.
Neo-Sindarin: For purposes of Neo-Sindarin, I would adapt this word as ᴺS. amosgarn “robin, (lit.) red-breast” as a combination of ᴺS. ammos “breast” and a modified form of S. caran “red”.