polly fish vs pollyfish

polly fish and pollyfish both are nouns.

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

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

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

Other synonyms of polly fish include parrotfish.

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