mutilation vs accidental injury

mutilation and accidental injury both are nouns.

Word	Noun	Adjective	Verb	Adverb
mutilation	Yes	No	No	No
accidental injury	Yes	No	No	No

As nouns, accidental injury is a hypernym of mutilation; that is, accidental injury is a word with a broader meaning than mutilation:

mutilation: an injury that causes disfigurement or that deprives you of a limb or other important body part
accidental injury: an accident that results in physical damage or hurt

Other hypernyms of mutilation include injury.

mutilation (noun)	accidental injury (noun)
the act of damaging the appearance or surface of something	an accident that results in physical damage or hurt
an injury that causes disfigurement or that deprives you of a limb or other important body part