Yes, deck is a Scrabble word!
...and is worth 11 points in Scrabble, and 12 points in Words with Friends
deck
Verb
1. Be beautiful to look at
2. Decorate
3. Knock down with force
Noun
1. Any of various platforms built into a vessel
2. Street name for a packet of illegal drugs
3. A pack of 52 playing cards
4. A porch that resembles the deck on a ship
What Scrabble words can I make with the letters in deck?
2 Letter Words