scare vs frighten off

scare is a noun but frighten off is not a noun.

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

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

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

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

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

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