hawksbill vs marine turtle

hawksbill and marine turtle both are nouns.

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

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

hawksbill: 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 hawksbill include sea turtle.

hawksbill (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