The Collaborative International Dictionary of English v.0.48:

hardboard \hard"board`\ n.
   a cheap hard material made from wood chips that are pressed
   together and bound with synthetic resin to form sheets, used
   in construction and various other purposes; -- called also
   particle board and chipboard.

   Syn: chipboard.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

fiberboard \fiberboard\ n.
   a type of wallboard composed of wood chips or shavings bonded
   together with resin and compressed into rigid sheets, calle
   also particle board.

   Syn: fibreboard, particle board.
        [WordNet 1.5] Fibered

WordNet (r) 3.0 (2006):

particle board
    n 1: wallboard composed of wood chips or shavings bonded
         together with resin and compressed into rigid sheets [syn:
         fiberboard, fibreboard, particle board]