Sud.

My husband and I are hooked on Scrabulous. I hate to admit this, but he's better at it than I am and has won most games.

This is a conversation we just had while playing:

"Just cause these guys are from India doesn't mean they can't know 'sud' is a word," says husband.

(The makers of Scrabulous (yes, stolen from the game Scrabble) are from India.)

"Sud is not a word," says I.

"Yes it is! SUDS! It's a word!" says husband.

"SUDS is a word, SUD is not," says I.

I look it up. Sud is not found in any English dictionary. However, 'suds' is. I tell him this.

"See! It's a word!" says husband.

"Suds is a word, but you can't have just one suds, or, sud. You have SUDS."

"Whatever," says husband.