Yes, DANDELION is a Scrabble word!

Letter values in Scrabble US: D 2, A 1, N 1, D 2, E 1, L 1, I 1, O 1, N 1.

Is it a valid word?

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

any of several herbs of the genus Taraxacum having long tap roots and deeply notched leaves and bright yellow flowers followed by fluffy seed balls