Drywall mud and wood filler are two different materials used for different purposes.
Drywall mud, also known as joint compound, is used to fill gaps and seams in drywall. It is a gypsum-based material that dries hard and can be sanded smooth once it has dried. Drywall mud is typically used to finish joints between sheets of drywall and to cover screw and nail heads.
Wood filler, on the other hand, is a putty-like substance that is used to fill small gaps and holes in wood. It is made of a mixture of wood particles and a binding agent, such as latex or epoxy. Once it dries, it can be sanded, stained, and painted to match the surrounding wood.
While both drywall mud and wood filler can be used to fill gaps and holes, they are not interchangeable. Drywall mud is designed for use with drywall and should not be used on wood surfaces. Wood filler is designed for use with wood and should not be used on drywall.
In summary, drywall mud is used for finishing drywall, while wood filler is used for filling gaps and holes in wood. It is important to use the right material for the job to ensure a professional-looking finish.