gurnard vs tub gurnard

gurnard and tub gurnard both are nouns.

Word	Noun	Adjective	Verb	Adverb
gurnard	Yes	No	No	No
tub gurnard	Yes	No	No	No

As nouns, tub gurnard is a hyponym of gurnard; that is, tub gurnard is a word with a more specific, narrower meaning than gurnard:

gurnard: bottom-dwelling coastal fishes with spiny armored heads and fingerlike pectoral fins used for crawling along the sea bottom
tub gurnard: a kind of gurnard

Other hyponyms of gurnard include Trigla lucerna, yellow gurnard, sea robin, searobin.

gurnard (noun)	tub gurnard (noun)
bottom-dwelling coastal fishes with spiny armored heads and fingerlike pectoral fins used for crawling along the sea bottom	a kind of gurnard