hawksbill vs sea turtle

hawksbill and sea turtle both are nouns.

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

As nouns, sea turtle is a hypernym of hawksbill; that is, sea 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
sea turtle: any of various large turtles with limbs modified into flippers; widely distributed in warm seas

Other hypernyms of hawksbill include marine turtle.

hawksbill (noun)	sea 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