Solid ground is a term used to describe a stable surface that can support weight and is not prone to shifting or sinking. The crossword solutions for this term are LAND (4 letters), BEDROCK (7 letters), EARTH (5 letters), FOUNDATION (10 letters), and TERRAFIRMA (10 letters). LAND is a general term for the solid surface of the EARTH, while BEDROCK is a layer of solid rock beneath the soil. EARTH is another term for the planet we live on, while FOUNDATION is a base or support for something. Terrafirma is a Latin term meaning 'solid ground'.