backlash vs happen

backlash is a noun but happen is not a noun.

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

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

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

backlash (noun)	happen (noun)
an adverse reaction to some political or social occurrence
a movement back from an impact

backlash (verb)	happen (verb)
come back to the originator of an action with an undesired effect	come to pass
	come into being; become reality
	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