Yes, FRIEND is a Scrabble word!

Letter values in Scrabble US: F 4, R 1, I 1, E 1, N 1, D 2.

Is it a valid word?

FRIEND is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a person you know well and regard with affection and trust
an associate who provides cooperation or assistance
a person with whom you are acquainted
a person who backs a politician or a team etc.
a member of the Religious Society of Friends founded by George Fox (the Friends have never called themselves Quakers)