injury vs personnel casualty

injury and personnel casualty both are nouns.

Word	Noun	Adjective	Verb	Adverb
injury	Yes	No	No	No
personnel casualty	Yes	No	No	No

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

Other hypernyms of injury include loss.

injury (noun)	personnel casualty (noun)
wrongdoing that violates another's rights and is unjustly inflicted	military personnel lost by death or capture
an act that causes someone or something to receive physical damage
an accident that results in physical damage or hurt
a casualty to military personnel resulting from combat
any physical damage to the body caused by violence or accident or fracture etc.; the condition of an injury