Yes, keep 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)
"Keep" Definition
noun
Care; charge: The child is in my keep for the day.
The stronghold of a castle.
The strongest and securest part of a medieval castle.
idiom
For keeps For an indefinitely long period: gave the ring to me for keeps.
Keep (someone) company To accompany or remain with.
Keep a stiff upper lip To be courageous or stoic in the face of adversity.
Keep an eye on To watch closely or carefully: keep your eye on the ball.
Keep an eye on To watch over attentively; mind.
phrasal-verb
Keep at To persevere in work or an action.
Keep down To hold under control or at a reduced level: Keep your voice down.
Keep down To prevent from growing, accomplishing, or succeeding: keep the revolutionaries down.
Keep down To refrain from vomiting: Although seasick, I managed to keep my food down.
Keep off To stay away from.
verb-transitive
To adhere or conform to; follow: keep late hours.
To cause to continue in a state, condition, or course of action: tried to keep the patient calm.
To detain: was kept after school.
To enter (data) in a book: keep financial records.
verb-intransitive
To continue to do: keep on talking; keep guessing.
To remain in a state or condition; stay: keep in line; keep quiet; kept well.
We love the game of Scrabble®, which is why we created Free Scrabble Dictionary - a simple lookup tool to check if the word you want to play is valid in the game of Scrabble®. At the top of every page, you can enter your word and click "Search Dictionary." We'll let you know whether your word is playable and provide a few definitions as well.