Yes, cover is playable
...and is worth 12 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Cover" Definition
noun
A binding or enclosure for a book or magazine.
A false background and identity, especially for a spy.
A layer of clouds obscuring the sky or ground.
idiom
Cover (the) ground To deal with or accomplish something in a certain manner: The history course covered a lot of ground in six weeks.
Cover (the) ground To traverse a given distance with satisfying speed.
Take cover To seek concealment or protection, as from enemy fire.
Under cover Being hidden or protected, as by darkness.
Under cover In an enclosure for mailing.
verb-intransitive
Games To play a higher card than the one previously played.
To hide something in order to save someone from censure or punishment: cover up for a colleague.
To spread over a surface to protect or conceal something: a paint that covers well.
verb-transitive
Games To play a higher-ranking card than (the one previously played).
Music To record a cover version of (a song).
Obsolete To pardon or remit.
Sports To defend (a position or area): cover third base; cover the backcourt.
Sports To guard (an opponent playing offense).
verb
To have within the range of one's guns.
To hold within range of an aimed firearm.
To afford protection or security to.
To afford protection against or compensation for.
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