Rook is a 4 letter English word. It's valid Scrabble word worth 8 points. It's valid Words with friends word worth 8 points.
You can make 17 anagrams from letters in rook (koor).
before 900; Middle English rok(e), Old English hrōc; cognate with Old Norse hrōkr, Old High German hruoh
I carried the lady into her rook, and they ran for a surgeon and a midwife.
That they are,” replied the rook, “and they ought to be taught better.
He had a gun on his shoulder, and carried by the claws the body of a rook with white wings.
We'll rook him at poker and bridge and shooting, and a few other things.
The following day the Blackbird had a long talk with the rook.
Every rook within a mile flew from its eyrie and cawed strenuously.
One day he happened to mention his trouble and disappointment to the rook.
Swallows often buffet a crow; but this was a clear case of a rook attacking.
If one rook of a colony gets into trouble, all the rest are worried about him directly.
Then came a rook, in black, like a minister, with spectacles and white cravat.