A Friend

1. A person, typically someone other than a family member, spouse or lover, whose company one enjoys and towards whom one feels affection.
2. An associate who provides assistance.
3. A person with
4. A person who backs or supports something.
5. (informal) An object or idea that can be used for good.
6. (colloquial, ironic, used only in the vocative) Used as a form of address when warning someone.
7. (object-oriented programming) A function or class granted special access to the private and protected members of another class.
8. (climbing) A spring-loaded camming device.
9. (euphemistic) A lover; a boyfriend or girlfriend.
10. (Scotland, obsolete) A relative, a relation by blood or marriage.

(person whose company one enjoys):

(boyfriend or girlfriend): lover

(person with whom you are acquainted): acquaintance, contact

(person who provides assistance): ally

(person who backs something): admirer, booster, champion, protagonist, supporter

(form of address used in warning someone): buster, mate (British), pal, buddy, sonny

(person whose company one enjoys): enemy

(person with whom you are acquainted): stranger

(person who provides assistance): enemy, foe

We usually make a friend, or make friends with someone. See Appendix:Collocations of do, have, make, and take

In older texts and certain dialects, the phrase to friend means "as a friend or an ally", for exampleː "with God to frend (Spenser)". The antonym to the phrase to friend is to fiend.