blighty wound vs combat injury

blighty wound and combat injury both are nouns.

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

As nouns, combat injury is a hypernym of blighty wound; that is, combat injury is a word with a broader meaning than blighty wound:

blighty wound: a wound that would cause an English soldier to be sent home from service abroad
combat injury: a casualty to military personnel resulting from combat

Other hypernyms of blighty wound include injury, wound.

blighty wound (noun)	combat injury (noun)
a wound that would cause an English soldier to be sent home from service abroad	a casualty to military personnel resulting from combat