subscriber vs friend

subscriber and friend both are nouns.

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

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

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

subscriber (noun)	friend (noun)
someone who contributes (or promises to contribute) a sum of money	a person you know well and regard with affection and trust
someone who contracts to receive and pay for a service or a certain number of issues of a publication	a person with whom you are acquainted
someone who expresses strong approval	an associate who provides cooperation or assistance
	a person who backs a politician or a team etc.