Caulk, e.g. is a term used to describe a type of sealant or filler material used in building and repair work. It is typically used to fill gaps, cracks, and joints in order to prevent water, air, dust, and other contaminants from entering the area. The two crossword solutions for this term are 'SEALER' (6 letters) and 'SEAL' (4 letters). SEALER is a substance used to create a barrier between two surfaces, while SEAL is an act of closing off an area or space. Both terms are related to Caulk, e.g. as they all involve creating a barrier to keep out unwanted elements.