claw vs scratch up

claw is a noun but scratch up is not a noun.

Word	Noun	Adjective	Verb	Adverb
claw	Yes	No	Yes	No
scratch up	No	No	Yes	No

As verbs, scratch up is a hypernym of claw; that is, scratch up is a word with a broader meaning than claw:

Other hypernyms of claw include scrape, scratch.

claw (noun)	scratch up (noun)
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

claw (verb)	scratch up (verb)
attack as if with claws	cut the surface of; wear away the surface of
scratch, scrape, pull, or dig with claws or nails
clutch as if in panic
move as if by clawing, seizing, or digging