hawkbill vs marine turtle

hawkbill and marine turtle both are nouns.

Word	Noun	Adjective	Verb	Adverb
hawkbill	Yes	No	No	No
marine turtle	Yes	No	No	No

As nouns, marine turtle is a hypernym of hawkbill; that is, marine turtle is a word with a broader meaning than hawkbill:

hawkbill: pugnacious tropical sea turtle with a hawk-like beak; source of food and the best tortoiseshell
marine turtle: any of various large turtles with limbs modified into flippers; widely distributed in warm seas

Other hypernyms of hawkbill include sea turtle.

hawkbill (noun)	marine turtle (noun)
pugnacious tropical sea turtle with a hawk-like beak; source of food and the best tortoiseshell	any of various large turtles with limbs modified into flippers; widely distributed in warm seas