drop away vs fall away

drop away and fall away both are verbs.

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

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

Other synonyms of drop away include drop off, slip.

drop away (verb)	fall away (verb)
fall to a lower standard	fall to a lower standard
	diminish in size or intensity