donor vs subscriber

donor and subscriber both are nouns.

Word	Noun	Adjective	Verb	Adverb
donor	Yes	No	No	No
subscriber	Yes	No	No	No

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

donor: person who makes a gift of property
subscriber: someone who contributes (or promises to contribute) a sum of money

donor (noun)	subscriber (noun)
person who makes a gift of property	someone who contributes (or promises to contribute) a sum of money
(medicine) someone who gives blood or tissue or an organ to be used in another person (the host)	someone who contracts to receive and pay for a service or a certain number of issues of a publication
	someone who expresses strong approval