bird's foot vs claw

bird's foot and claw both are nouns.

Word	Noun	Adjective	Verb	Adverb
bird's foot	Yes	No	No	No
claw	Yes	No	Yes	No

As nouns, claw is a hyponym of bird's foot; that is, claw is a word with a more specific, narrower meaning than bird's foot:

Other hyponyms of bird's foot include zygodactyl foot, heterodactyl foot, webbed foot, lobate foot.

bird's foot (noun)	claw (noun)
the foot of a bird	sharp curved horny process on the toe of a bird or some mammals or reptiles
	a bird's foot
	a grasping structure on the limb of a crustacean or other arthropods
	a mechanical device that is curved or bent to suspend or hold or pull something

bird's foot (verb)	claw (verb)
	attack as if with claws
	scratch, scrape, pull, or dig with claws or nails
	clutch as if in panic
	move as if by clawing, seizing, or digging