scrunch up vs crouch

scrunch up is not a noun while crouch is a noun.

Word	Noun	Adjective	Verb	Adverb
scrunch up	No	No	Yes	No
crouch	Yes	No	Yes	No

As verbs, scrunch up and crouch are synonyms defined as:

Other synonyms of scrunch up include hunker, hunker down, scrunch, squat.

scrunch up (noun)	crouch (noun)
	the act of bending low with the limbs close to the body

scrunch up (verb)	crouch (verb)
make wrinkles or creases on a smooth surface; make a pressed, folded or wrinkled line in; `crisp' is archaic	sit on one's heels
sit on one's heels	bend one's back forward from the waist on down