Scrabble Dictionary

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Yes, retreat is playable

...and is worth 7 points.

Found in the following dictionaries

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OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Retreat" Definition

noun

A bugle call or drumbeat signaling the lowering of the flag at sunset, as on a military base.
A period of group withdrawal for prayer, meditation, or study: a religious retreat.
A period of seclusion, retirement, or solitude.
A place affording peace, quiet, privacy, or security. See Synonyms at shelter.
The act or process of withdrawing, especially from something hazardous, formidable, or unpleasant.

verb-transitive

Games To move (a chess piece) back.

verb-intransitive

To fall or draw back; withdraw or retire. See Synonyms at recede1.
To slope backward.

verb

To make a retreat .
To slope backward.
To draw or lead back .
To move (a piece) back in chess.