The word 'friend' is a common noun, a general word for anyone with whom one has a bond of mutual affection; a word for any friend of anyone.
A proper noun is the name of a specific person, place, or thing. A proper noun form the common noun 'friend' is the name of a friend.
The word 'friend' is also a verb meaning to add someone to a list of contacts associated with a social networking website.
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