backlash vs occur

backlash is a noun but occur is not a noun.

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

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

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

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

backlash (verb)	occur (verb)
come back to the originator of an action with an undesired effect	come to pass
	come to one's mind; suggest itself
	to be found to exist