Base
Nouns
- base, basement
- plinth, dado, wainscot
- baseboard, mopboard
- bedrock, hardpan [U.S.]
- foundation etc. (support) Support
- substructure, substratum, ground, earth, pavement, floor, paving, flag, carped, ground floor, deck
- footing, ground work, basis
- hold, bilge. bottom, nadir, foot, sole, toe, hoof, keel, root
- centerboard.
Adjectives
- bottom, undermost, nethermost
- fundamental
- founded on, based on, grounded on, built on.