Yes, CONFLICT is a Scrabble word!

Letter values in Scrabble US: C 3, O 1, N 1, F 4, L 1, I 1, C 3, T 1.

Is it a valid word?

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

an open clash between two opposing groups (or individuals)
opposition between two simultaneous but incompatible feelings
a hostile meeting of opposing military forces in the course of a war
a state of opposition between persons or ideas or interests
an incompatibility of dates or events
opposition in a work of drama or fiction between characters or forces (especially an opposition that motivates the development of the plot)
a disagreement or argument about something important

Also: difference of opinion, run afoul.