cardboard, composition board

a stiff moderately thick paper

• binder's board, binder board — a cardboard used by bookbinders to make covers for books
• card — thin cardboard, usually rectangular
• corrugated board, corrugated cardboard — cardboard with corrugations (can be glued to flat cardboard on one or both sides)
• paperboard, posterboard — a cardboard suitable for making posters
• pasteboard — stiff cardboard made by pasting together layers of paper
• strawboard — a coarse yellow cardboard made of straw pulp

• paper — a material made of cellulose pulp derived mainly from wood or rags or certain grasses
• packing material, packing, wadding — any material used especially to protect something