bedrock (n.)

• basalt
• base
• basement
• basic
• basis
• bed
• bedding
• belly
• bottom
• breccia
• breech
• buttocks
• central
• conglomerate
• crag
• downside
• essential
• floor
• flooring
• footing
• foundation
• fundament
• fundamental
• gneiss
• granite
• ground
• grounds
• groundwork
• hardpan
• infrastructure
• lava
• limestone
• magma
• material
• monolith
• nadir
• pahoehoe
• pavement
• pillar
• porphyry
• principle
• radical
• rock
• root
• rubble
• rudiment
• sandstone
• schist
• scoria
• scree
• seat
• sill
• stone
• substantive
• substratum
• substructure
• talus
• tower
• tufa
• tuff
• underbelly
• undercarriage
• underside
• understructure
• vital