The crossword solution for the term 'FILLED IN SOME GAPS' is CAULKED, which is a seven-letter word. Caulking is a process of sealing joints or seams in various structures and piping systems by using materials such as silicone, polyurethane, or acrylic latex caulk. It is used to prevent water, air, dust, and other contaminants from entering the structure or system. Caulking is also used to fill gaps between two surfaces, such as between a window frame and wall, to provide insulation and soundproofing.