Yes, DRAGONFLIES is a Scrabble word!

Letter values in Scrabble US: D 2, R 1, A 1, G 2, O 1, N 1, F 4, L 1, I 1, E 1, S 1.

Is it a valid word?

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

slender-bodied non-stinging insect having iridescent wings that are outspread at rest; adults and nymphs feed on mosquitoes etc.

Also: darning needle, devil's darning needle, sewing needle, snake feeder, snake doctor, mosquito hawk, skeeter hawk.