head for the hills vs scat

head for the hills is not a noun while scat is a noun.

Word	Noun	Adjective	Verb	Adverb
head for the hills	No	No	Yes	No
scat	Yes	No	Yes	No

As verbs, head for the hills and scat are synonyms defined as:

Other synonyms of head for the hills include break away, bunk, escape, fly the coop, hightail it, lam, run, run away, scarper, take to the woods, turn tail.

head for the hills (noun)	scat (noun)
	singing jazz; the singer substitutes nonsense syllables for the words of the song and tries to sound like a musical instrument

head for the hills (verb)	scat (verb)
flee; take to one's heels; cut and run	flee; take to one's heels; cut and run