repeat vs fall out

repeat is a noun but fall out is not a noun.

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

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

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

repeat (noun)	fall out (noun)
an event that repeats

repeat (verb)	fall out (verb)
happen or occur again	come to pass
to say, state, or perform again	have a breach in relations
to say again or imitate	drop out
make or do or perform again	leave (a barracks) in order to take a place in a military formation, or leave a military formation
repeat an earlier theme of a composition	come as a logical consequence; follow logically
do over