donor card vs identity card

donor card and identity card both are nouns.

Word	Noun	Adjective	Verb	Adverb
donor card	Yes	No	No	No
identity card	Yes	No	No	No

As nouns, identity card is a hypernym of donor card; that is, identity card is a word with a broader meaning than donor card:

donor card: a card that you carry on your person and that authorizes the use of your organs for transplantation after your death
identity card: a card certifying the identity of the bearer

Other hypernyms of donor card include card.

donor card (noun)	identity card (noun)
a card that you carry on your person and that authorizes the use of your organs for transplantation after your death	a card certifying the identity of the bearer