frighten vs scare

frighten is not a noun while scare is a noun.

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

As verbs, frighten and scare are synonyms defined as:

Other synonyms of frighten include affright, fright.

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

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