Yes, MORALE is a Scrabble word!

Letter values in Scrabble US: M 3, O 1, R 1, A 1, L 1, E 1.

Is it a valid word?

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

a state of individual psychological well-being based upon a sense of confidence and usefulness and purpose
the spirit of a group that makes the members want the group to succeed

Also: esprit de corps, team spirit.