The term 'Fill Cracks' can be solved by the crossword solution 'CAULK', which is a type of material used to seal cracks and gaps in various surfaces. CAULK is typically made of silicone, latex, or acrylic, and is applied with a caulking gun. It is often used to fill in gaps between two surfaces, such as around windows and doors, to prevent air and water from entering. CAULK is also used to fill in cracks in walls and floors, and to seal around pipes and other fixtures.