Fibreboard and Wallboard

Fibreboard noun - Wallboard composed of wood chips or shavings bonded together with resin and compressed into rigid sheets.

Wallboard and fibreboard are semantically related. In some cases you can use "Wallboard" instead a noun "Fibreboard".

Wallboard noun - A wide flat board used to cover walls or partitions; made from plaster or wood pulp or other materials and used primarily to form the interior walls of houses.

Fibreboard and wallboard are semantically related. Sometimes you can replace term "Fibreboard" with "Wallboard", this nouns are similar.