angler fish vs anglerfish

angler fish and anglerfish both are nouns.

Word	Noun	Adjective	Verb	Adverb
angler fish	Yes	No	No	No
anglerfish	Yes	No	No	No

As nouns, angler fish and anglerfish are synonyms defined as:

angler fish and anglerfish: fishes having large mouths with a wormlike filament attached for luring prey

Other synonyms of angler fish include allmouth, angler, goosefish, Lophius Americanus, lotte, monkfish.

angler fish (noun)	anglerfish (noun)
fishes having large mouths with a wormlike filament attached for luring prey	fishes having large mouths with a wormlike filament attached for luring prey