damselfish vs demoiselle

damselfish and demoiselle both are nouns.

Word	Noun	Adjective	Verb	Adverb
damselfish	Yes	No	No	No
demoiselle	Yes	No	No	No

As nouns, damselfish and demoiselle are synonyms defined as:

damselfish and demoiselle: small brilliantly colored tropical marine fishes of coral reefs

damselfish (noun)	demoiselle (noun)
small brilliantly colored tropical marine fishes of coral reefs	small brilliantly colored tropical marine fishes of coral reefs
	a young unmarried woman