sharksucker vs suckerfish

sharksucker and suckerfish both are nouns.

Word	Noun	Adjective	Verb	Adverb
sharksucker	Yes	No	No	No
suckerfish	Yes	No	No	No

As nouns, suckerfish is a hypernym of sharksucker; that is, suckerfish is a word with a broader meaning than sharksucker:

sharksucker: remoras found attached to sharks
suckerfish: marine fishes with a flattened elongated body and a sucking disk on the head for attaching to large fish or moving objects

Other hypernyms of sharksucker include remora, sucking fish.

sharksucker (noun)	suckerfish (noun)
remoras found attached to sharks	marine fishes with a flattened elongated body and a sucking disk on the head for attaching to large fish or moving objects