recur vs happen

recur and happen both are verbs.

Word	Noun	Adjective	Verb	Adverb
recur	No	No	Yes	No
happen	No	No	Yes	No

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

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

recur (verb)	happen (verb)
happen or occur again	come to pass
return in thought or speech to something	come into being; become reality
have recourse to	happen, occur, or be the case in the course of events or by chance
	come upon, as if by accident; meet with
	chance to be or do something, without intention or causation