grievance

nouns

a resentment strong enough to justify retaliation
"holding a grudge"; "settling a score"
grievance, grudge, score
an allegation that something imposes an illegal obligation or denies some legal right or causes injustice
grievance
is a type of (narrower)
(law) a formal accusation against somebody (often in a court of law)
"an allegation of malpractice"
allegation
a complaint about a (real or imaginary) wrong that causes resentment and is grounds for action
grievance
is a type of (narrower)
an expression of grievance or resentment
complaint