Yes, EXECUTIONS is a Scrabble word!

Letter values in Scrabble US: E 1, X 8, E 1, C 3, U 1, T 1, I 1, O 1, N 1, S 1.

Is it a valid word?

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

putting a condemned person to death
the act of performing; of doing something successfully; using knowledge as distinguished from merely possessing it
(computer science) the process of carrying out an instruction by a computer
(law) the completion of a legal instrument (such as a contract or deed) by signing it (and perhaps sealing and delivering it) so that it becomes legally binding and enforceable
a routine court order that attempts to enforce the judgment that has been granted to a plaintiff by authorizing a sheriff to carry it out
the act of accomplishing some aim or executing some order
unlawful premeditated killing of a human being by a human being

Also: capital punishment, death penalty, carrying out, carrying into action, instruction execution, execution of instrument, writ of execution.