go out vs fall out

go out and fall out both are verbs.

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

As verbs, fall out is a hyponym of go out; that is, fall out is a word with a more specific, narrower meaning than go out:

go out: move out of or depart from
fall out: leave (a barracks) in order to take a place in a military formation, or leave a military formation

Other hyponyms of go out include depart, go, go away, pop out, file out, get off, hop out, get off, step out, eject, undock, log off, log out.

go out (verb)	fall out (verb)
become extinguished	come to pass
move out of or depart from	have a breach in relations
take the field	drop out
leave the house to go somewhere	leave (a barracks) in order to take a place in a military formation, or leave a military formation
date regularly; have a steady relationship with	come as a logical consequence; follow logically
go out of fashion; become unfashionable