come about vs fall out

come about and fall out both are verbs.

Word	Noun	Adjective	Verb	Adverb
come about	No	No	Yes	No
fall out	No	No	Yes	No

As verbs, come about and fall out are synonyms defined as:

Other synonyms of come about include go on, hap, happen, occur, pass, pass off, take place.

come about (verb)	fall out (verb)
come to pass	come to pass
	have a breach in relations
	drop out
	leave (a barracks) in order to take a place in a military formation, or leave a military formation
	come as a logical consequence; follow logically