grievance vs grudge

grievance and grudge both are nouns.

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

As nouns, grievance and grudge are synonyms defined as:

Other synonyms of grievance include score.

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

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