Yes, let is playable
...and is worth 4 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Let" Definition
noun
Something that hinders; an obstacle: free to investigate without let or hindrance.
Sports An invalid stroke in tennis and other net games that requires a replay.
A shot or point in racket games that does not count and must be replayed.
verb-transitive
Archaic To hinder or obstruct.
To award, especially after bids have been submitted: let the construction job to a new firm.
To cause to; make: Let the news be known.
To give permission or opportunity to; allow: I let them borrow the car. The inheritance let us finally buy a house. See Usage Note at leave1.
To permit to enter, proceed, or depart: let the dog in.
idiom
Let (someone) have it Informal To beat, strike, or shoot at someone.
Let (someone) have it Informal To scold or punish.
Let (someone) in on To allow someone to participate in (something).
Let (someone) in on To reveal (a secret) to someone: They finally let me in on their plans.
Let alone Not to mention; much less: "Their ancestors had been dirt poor and never saw royalty, let alone hung around with them” ( Garrison Keillor).
phrasal-verb
Let down To cause to come down gradually; lower: let down the sails.
Let down To fail to meet the expectations of; disappoint.
Let down To withdraw support from; forsake.
Let out To come to a close; end: School let out early. The play let out at 11 P.M.
verb-intransitive
To be or become assigned, as to a contractor.
To become rented or leased.
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