The word is "Melamine", which is the name of the resin used to bind the wood powders in that family of engineered wood products.

You actually want tile board, which is a coated, thin hardboard used in bathroom walls. The particles in hardboard are finer than medium-density fiberboard (MDF), which is finer than particle board), all of which are varieties of melamine board.

This is what I did too. I used the little plastic notches (probably not the right term) that you screw into the wall to mount bathroom mirrors.

Two huge white boards, flat, easy to remove, < $30.