Gnomish
gwim
noun. spark, wink
gwimla-
verb. to wink, twinkle
gwimpel
noun. sparkling (n.), scintillation
uimoth
noun. whale, (lit.) sheep of the waves
sint
noun. spark
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!
A noun appearing as G. uimoth “a whale” in the Gnomish Lexicon of the 1910s, literally meaning “sheep of the waves”, a combination of G. uin “†wave” and G. moth “sheep” (GL/74). In the Gnomish Lexicon, the sense “wave” for uin was marked as archaic (†), and it also came to mean “whale” in ordinary speech after the name of the great whale Uin.
Neo-Sindarin: For purposes of Neo-Sindarin, I would update this word to ᴺS. gwimmaf “whale”, a combination of gwing “foam” and [ᴺS.] maf “sheep”.