Yes, command is playable
...and is worth 18 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Command" Definition
noun
A military unit, post, district, or region under the control of one officer.
A unit of the U.S. Air Force that is larger than an air force.
Ability to control or use; mastery: command of four languages.
An order given with authority.
Computer Science A signal that initiates an operation defined by an instruction.
adjective
Done or performed in response to a command: a command performance.
Of, relating to, or constituting a command: command headquarters; a command decision.
Done on command or request .
verb-transitive
To direct with authority; give orders to.
To dominate by physical position; overlook: a mountain commanding the valley below.
To exercise dominating, authoritative influence over: "He commands any room he enters” ( Stephen Schiff).
To have control or authority over; rule: a general who commands an army.
verb-intransitive
To exercise authority or control as or as if one is a commander.
verb
To direct authoritatively .
to exercise a dominating influence over have command of as.
To have at one's immediate disposal .
To demand or receive as one's due .
To overlook or dominate from or as if from a strategic position .
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