polly fish vs parrotfish

polly fish and parrotfish both are nouns.

Word	Noun	Adjective	Verb	Adverb
polly fish	Yes	No	No	No
parrotfish	Yes	No	No	No

As nouns, polly fish and parrotfish are synonyms defined as:

polly fish and parrotfish: gaudy tropical fishes with parrotlike beaks formed by fusion of teeth

Other synonyms of polly fish include pollyfish.

polly fish (noun)	parrotfish (noun)
gaudy tropical fishes with parrotlike beaks formed by fusion of teeth	gaudy tropical fishes with parrotlike beaks formed by fusion of teeth