sea robin vs gurnard

sea robin and gurnard both are nouns.

Word	Noun	Adjective	Verb	Adverb
sea robin	Yes	No	No	No
gurnard	Yes	No	No	No

As nouns, gurnard is a hypernym of sea robin; that is, gurnard is a word with a broader meaning than sea robin:

sea robin: American gurnard; mostly found in bays and estuaries
gurnard: bottom-dwelling coastal fishes with spiny armored heads and fingerlike pectoral fins used for crawling along the sea bottom

sea robin (noun)	gurnard (noun)
American gurnard; mostly found in bays and estuaries	bottom-dwelling coastal fishes with spiny armored heads and fingerlike pectoral fins used for crawling along the sea bottom