conch vs Strombus gigas

conch and Strombus gigas both are nouns.

Word	Noun	Adjective	Verb	Adverb
conch	Yes	No	No	No
Strombus gigas	Yes	No	No	No

As nouns, Strombus gigas is a hyponym of conch; that is, Strombus gigas is a word with a more specific, narrower meaning than conch:

conch: any of various edible tropical marine gastropods of the genus Strombus having a brightly-colored spiral shell with large outer lip
Strombus gigas: a large variety of conch

Other hyponyms of conch include giant conch.

conch (noun)	Strombus gigas (noun)
any of various edible tropical marine gastropods of the genus Strombus having a brightly-colored spiral shell with large outer lip	a large variety of conch