happen vs fall out

happen and fall out both are verbs.

Word	Noun	Adjective	Verb	Adverb
happen	No	No	Yes	No
fall out	No	No	Yes	No

As verbs, happen and fall out are synonyms defined as:

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

As verbs, fall out is a hypernym of happen; that is, fall out is a word with a broader meaning than happen:

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

As verbs, fall out is a hypernym of happen; that is, fall out is a word with a broader meaning than happen:

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

happen (verb)	fall out (verb)
come to pass	come to pass
come into being; become reality	have a breach in relations
happen, occur, or be the case in the course of events or by chance	drop out
come upon, as if by accident; meet with	leave (a barracks) in order to take a place in a military formation, or leave a military formation
chance to be or do something, without intention or causation	come as a logical consequence; follow logically