Yes, rule is playable
...and is worth 6 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Rule" Definition
noun
A generalized statement that describes what is true in most or all cases: In this office, hard work is the rule, not the exception.
A usual, customary, or generalized course of action or behavior: "The rule of life in the defense bar ordinarily is to go along and get along” ( Scott Turow).
An authoritative, prescribed direction for conduct, especially one of the regulations governing procedure in a legislative body or a regulation observed by the players in a game, sport, or contest.
Governing power or its possession or use; authority.
Law A court order limited in application to a specific case.
idiom
As a rule In general; for the most part: As a rule, we take the bus.
phrasal-verb
Rule out To prevent; preclude: The snowstorm ruled out their weekly meeting.
Rule out To remove from consideration; exclude: The option of starting over has been ruled out.
verb-intransitive
Slang To be excellent or superior: That new video game rules!.
To be in total control or command; exercise supreme authority.
To formulate and issue a decree or decision.
To prevail at a particular level or rate: Prices ruled low.
verb-transitive
To decide or declare authoritatively or judicially; decree. See Synonyms at decide.
To dominate by powerful influence.
To exercise control, dominion, or direction over; govern.
To mark (a straight line), as with a ruler.
To mark with straight parallel lines.
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