hunker down vs scrunch

hunker down is not a noun while scrunch is a noun.

Word	Noun	Adjective	Verb	Adverb
hunker down	No	No	Yes	No
scrunch	Yes	No	Yes	No

As verbs, hunker down and scrunch are synonyms defined as:

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

hunker down (noun)	scrunch (noun)
	a crunching noise

hunker down (verb)	scrunch (verb)
hold stubbornly to a position	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
take shelter	make a noise typical of an engine lacking lubricants