Cos is a 3 letter English word. It's valid Scrabble word worth 5 points. It's valid Words with friends word worth 6 points.
You can make 12 anagrams from letters in COS (cos).
1690-1700; after Kos, where it originated
Him knows there's five, for him can count up to five, 'cos five's just as old as him is going to be.
It's different with granny, 'cos she's our granny right enough.
"'cos why, you don't shout loud enuff," explained the bigger girl.
And them's just as tired as Duke's; 'cos I'm bigger, my feets have more heavy to carry.
But they couldn't, you know, cos the pain in my back was too bad.
"Burn a Bush cos' for peace he no push no button," he said during an HBO Def Poetry appearance in 2007.
Mole first, 'cos I'm very pleased with him; Rat next; Toad last.
I maade a mistake in takin' Jasper to Kynance, 'cos Tamsin got to like un.
"Or perhaps he is waiting for cos to come up," said another.
He spoke in halting syllables of cos, the language of the inner planets!