lumpsucker vs lumpfish

lumpsucker and lumpfish both are nouns.

Word	Noun	Adjective	Verb	Adverb
lumpsucker	Yes	No	No	No
lumpfish	Yes	No	No	No

As nouns, lumpfish is a hypernym of lumpsucker; that is, lumpfish is a word with a broader meaning than lumpsucker:

lumpsucker: any of several very small lumpfishes
lumpfish: clumsy soft thick-bodied northern Atlantic fish with pelvic fins fused into a sucker; edible roe used for caviar

Other hypernyms of lumpsucker include Cyclopterus lumpus.

lumpsucker (noun)	lumpfish (noun)
any of several very small lumpfishes	clumsy soft thick-bodied northern Atlantic fish with pelvic fins fused into a sucker; edible roe used for caviar