foe, faux

Foe or foe means enemy or opponent--
The soldiers were trained to face the foe without flinching.
His old friend became a determined foe when he sat down to play checkers.

Faux or faux ( rhymes woth foe ) describes a fake or imitation substance--
The countertops are made of faux granite.
She wore a tiara of faux pearls.

Now that you know that, you can say--
"They sat on either side of a chessboard of faux marble, each a bitter foe of the other until the game was over."

Note--"faux pas" is French for "false step", most commonly used in English to mean a social blunder--
He called his boss by the wrong name; what an awful faux pas.