subscriber vs protagonist

subscriber and protagonist both are nouns.

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

As nouns, protagonist is a hypernym of subscriber; that is, protagonist is a word with a broader meaning than subscriber:

Other hypernyms of subscriber include admirer, booster, champion, friend, supporter.

subscriber (noun)	protagonist (noun)
someone who contributes (or promises to contribute) a sum of money	a person who backs a politician or a team etc.
someone who contracts to receive and pay for a service or a certain number of issues of a publication	the principal character in a work of fiction
someone who expresses strong approval