whale sucker vs remora

whale sucker and remora both are nouns.

Word	Noun	Adjective	Verb	Adverb
whale sucker	Yes	No	No	No
remora	Yes	No	No	No

As nouns, remora is a hypernym of whale sucker; that is, remora is a word with a broader meaning than whale sucker:

whale sucker: large blue Pacific remora that attaches to whales and dolphins
remora: 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 whale sucker include suckerfish, sucking fish.

whale sucker (noun)	remora (noun)
large blue Pacific remora that attaches to whales and dolphins	marine fishes with a flattened elongated body and a sucking disk on the head for attaching to large fish or moving objects