frighten away vs scare

frighten away is not a noun while scare is a noun.

Word	Noun	Adjective	Verb	Adverb
frighten away	No	No	Yes	No
scare	Yes	No	Yes	No

As verbs, frighten away and scare are synonyms defined as:

frighten away and scare: cause to lose courage; to be daunted; to be scared away

Other synonyms of frighten away include dash, daunt, frighten off, pall, scare away, scare off.

frighten away (noun)	scare (noun)
	a sudden attack of fear
	sudden mass fear and anxiety over anticipated events

frighten away (verb)	scare (verb)
cause to lose courage; to be daunted; to be scared away	cause fear in
	cause to lose courage; to be daunted; to be scared away