Yes, separate is playable
...and is worth 11 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Separate" Definition
noun
A garment, such as a skirt, jacket, or pair of slacks, that may be purchased separately and worn in various combinations with other garments.
An article of dress designed to be worn interchangeably with others to form various costume combinations .
verb
To make a distinction between .
To disperse in space or time .
To set aside for a special purpose .
adjective
Archaic Withdrawn from others; solitary.
Existing as an independent entity.
Having undergone schism or estrangement from a parent body: Separate churches.
Not shared; individual: two people who held separate views on the issue.
Set or kept apart; disunited: Libraries often have a separate section for reference books.
verb-intransitive
To become divided into components or parts: Oil and water tend to separate.
To part company; disperse.
To stop living together as spouses.
To withdraw: The state threatened to separate from the Union.
verb-transitive
To differentiate or discriminate between; distinguish: a researcher who separated the various ethnic components of the population sample.
To part (a couple), often by decree: She was separated from her husband last year.
To remove from a mixture or combination; isolate.
To set or keep apart; disunite.
To sort: separate mail by postal zones.
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