fall off vs fall away

fall off and fall away both are verbs.

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

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

fall off (verb)	fall away (verb)
fall heavily or suddenly; decline markedly	fall to a lower standard
diminish in size or intensity	diminish in size or intensity
come off