Thick paper is a type of paper that is thicker and more durable than regular paper. It can be made from a variety of materials, including CARDBOARD and CARD. The crossword solutions for the term 'thick paper' are CARDBOARD (9 letters) and CARD (4 letters). CARDBOARD is a stiff, thick paper-like material made from recycled paper products, while CARD is a thin, flexible material made from plastic or paper. Both materials are commonly used to make thick paper products such as business cards, postcards, and greeting cards.