buffalo fish vs buffalofish

buffalo fish and buffalofish both are nouns.

Word	Noun	Adjective	Verb	Adverb
buffalo fish	Yes	No	No	No
buffalofish	Yes	No	No	No

As nouns, buffalo fish and buffalofish are synonyms defined as:

buffalo fish and buffalofish: any of several large suckers of the Mississippi valley

buffalo fish (noun)	buffalofish (noun)
any of several large suckers of the Mississippi valley	any of several large suckers of the Mississippi valley
	large carp-like North American fish