injury vs ill service

injury and ill service both are nouns.

Word	Noun	Adjective	Verb	Adverb
injury	Yes	No	No	No
ill service	Yes	No	No	No

As nouns, ill service is a hyponym of injury; that is, ill service is a word with a more specific, narrower meaning than injury:

Other hyponyms of injury include disservice, ill turn, spoil, spoilage, spoiling.

injury (noun)	ill service (noun)
wrongdoing that violates another's rights and is unjustly inflicted	an act intended to help that turns out badly
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