テイ

そこ

底, 广, 厂, 氐, 氏, 一

广

bottom, sole, depth, bottom price, base, kind, sort

徹底(てってい): thoroughness; completeness; consistency
底(そこ): bottom; sole
根底(こんてい): root; basis; foundation
到底(とうてい): (cannot) possibly; no matter how