Yes, BEGUINE is a Scrabble word!

Letter values in Scrabble US: B 3, E 1, G 2, U 1, I 1, N 1, E 1.

Is it a valid word?

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

(Roman Catholic Church) a member of a lay sisterhood (one of several founded in the Netherlands in the 12th and 13th centuries); though not taking religious vows the sisters followed an austere life
music written in the bolero rhythm of the beguine dance
a ballroom dance that originated in the French West Indies; similar to the rumba