frighten away vs frighten off

frighten away and frighten off both are verbs.

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

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

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

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

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