【Injustice】 , 【injury】 ,  【wrong】 ,  【grievance】  are comparable when they denote an act that inflicts undeserved damage, loss, or hardship on a person.

【Injustice】 is the general term applicable not only to an act which involves unfairness to another or a violation of his rights, but, as a collective noun, to all acts which come under this description.

【Injury】 applies to an 【injustice】 to a person for which the law allows an action to recover compensation or specific property, or both.

【Wrong】  is, in law, a more general term than  【injury】  for it applies not only to all injuries as just defined (private wrongs ) but to all misdemeanors or crimes which affect the community (public wrongs ) and which are punishable according to the criminal code. But in general use  【wrong】  differs little from  【injustice】 , except in carrying a stronger connotation of flagrancy or of seriousness.

【Grievance】 applies to a circumstance or condition that, in the opinion of those affected, constitutes a 【wrong】 or that gives one just grounds for complaint.