Plywood is less fire-resistant than drywall. Due to the gypsum content, drywall is less likely to burn rapidly. Several thin wood sheets are glued together to form plywood. Plywood burns quickly in a house fire as its entirely made from wood. An adhesive is used to join the plywood sheets. Plywood is more expensive, harder to work with, and less fire resistant. It is also more resilient than drywall but is more challenging to repair when damaged.