Yes, JONQUILS is a Scrabble word!

Letter values in Scrabble US: J 8, O 1, N 1, Q 10, U 1, I 1, L 1, S 1.

Is it a valid word?

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

widely cultivated ornamental plant native to southern Europe but naturalized elsewhere having fragrant yellow or white clustered flowers
often used colloquially for any yellow daffodil

Also: narcissus jonquilla.