injury vs disservice

injury and disservice both are nouns.

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

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

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

injury (noun)	disservice (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