terra firma (n.)

• acres
• alluvion
• alluvium
• base
• basement
• basis
• bed
• bedding
• bedrock
• carpet
• clay
• clod
• cover
• crust
• deck
• dirt
• dust
• earth
• floor
• flooring
• footing
• foundation
• freehold
• fundament
• fundamental
• glebe
• grassland
• ground
• grounds
• groundwork
• hardpan
• land
• lithosphere
• marl
• mold
• parquet
• pave
• pavement
• paving
• principle
• radical
• region
• rudiment
• seat
• sill
• sod
• soil
• subsoil
• substratum
• substructure
• surfacing
• terrain
• territory
• topsoil
• undercarriage
• understructure
• woodland