remora vs whale sucker

remora and whale sucker both are nouns.

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

As nouns, whale sucker is a hyponym of remora; that is, whale sucker is a word with a more specific, narrower meaning than remora:

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

Other hyponyms of remora include Echeneis naucrates, sharksucker, Remilegia australis, whalesucker.

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