Yes, BEGONIA is a Scrabble word!

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

Is it a valid word?

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

any of numerous plants of the genus Begonia grown for their attractive glossy asymmetrical leaves and colorful flowers in usually terminal cymes or racemes