What is another word for "root"?

Roget's Thesaurus (1911) lists these synonyms for "root": artillery, base, baseboard, based, basement, basis, bilge, bottom, built, centerboard, concordance, conjugate, cube, dado, deck, delectus, derivation, derivative, dictionary, earth, etymology, etymon, exactly, flag, floor, foot, footing, foundation, fundamental, glossary, glossographer, glossology, gradus, grammar, ground, hardpan, hold, hoof, index, keel.