backlash vs repercussion

backlash and repercussion both are nouns.

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

As nouns, backlash and repercussion are synonyms defined as:

Other synonyms of backlash include rebound, recoil.

backlash (noun)	repercussion (noun)
an adverse reaction to some political or social occurrence	a movement back from an impact
a movement back from an impact	a remote or indirect consequence of some action

backlash (verb)	repercussion (verb)
come back to the originator of an action with an undesired effect