Yes, MORSE is a Scrabble word!

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

Is it a valid word?

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

a telegraph code in which letters and numbers are represented by strings of dots and dashes (short and long signals)
United States portrait painter who patented the telegraph and developed the Morse code (1791-1872)

Also: morse code, international morse code, samuel morse, samuel f. b. morse, samuel finley breese morse.