combat injury vs injury

combat injury and injury both are nouns.

Word	Noun	Adjective	Verb	Adverb
combat injury	Yes	No	No	No
injury	Yes	No	No	No

As nouns, combat injury and injury are synonyms defined as:

combat injury and injury: a casualty to military personnel resulting from combat

Other synonyms of combat injury include wound.

combat injury (noun)	injury (noun)
a casualty to military personnel resulting from combat	wrongdoing that violates another's rights and is unjustly inflicted
	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