Yes, MORRISES is a Scrabble word!

Letter values in Scrabble US: M 3, O 1, R 1, R 1, I 1, S 1, E 1, S 1.

Is it a valid word?

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

United States suffragist in Wyoming (1814-1902)
English poet and craftsman (1834-1896)
leader of the American Revolution who signed the Declaration of Independence and raised money for the Continental Army (1734-1806)
United States statesman who led the committee that produced the final draft of the United States Constitution (1752-1816)

Also: esther morris, esther hobart mcquigg slack morris, william morris, robert morris, gouverneur morris.