grudge vs grievance

grudge and grievance both are nouns.

Word	Noun	Adjective	Verb	Adverb
grudge	Yes	No	Yes	No
grievance	Yes	No	No	No

As nouns, grudge and grievance are synonyms defined as:

Other synonyms of grudge include score.

grudge (noun)	grievance (noun)
a resentment strong enough to justify retaliation	a complaint about a (real or imaginary) wrong that causes resentment and is grounds for action
	an allegation that something imposes an illegal obligation or denies some legal right or causes injustice
	a resentment strong enough to justify retaliation

grudge (verb)	grievance (verb)
accept or admit unwillingly
bear a grudge; harbor ill feelings