war crime vs crime

war crime and crime both are nouns.

Word	Noun	Adjective	Verb	Adverb
war crime	Yes	No	No	No
crime	Yes	No	No	No

As nouns, crime is a hypernym of war crime; that is, crime is a word with a broader meaning than war crime:

war crime: a crime committed in wartime; violation of rules of war
crime: (criminal law) an act punishable by law; usually considered an evil act

Other hypernyms of war crime include criminal offence, criminal offense, law-breaking.

war crime (noun)	crime (noun)
a crime committed in wartime; violation of rules of war	(criminal law) an act punishable by law; usually considered an evil act
	an evil act not necessarily punishable by law