Word

そこ
bottom; sole
Word

てい
base (logarithmic, exponential, number system); radix; base (triangle, cone, cylinder, etc.); type; kind; extent; degree
Word

海底

かいてい、うなぞこ
bottom of the ocean; undersea; submarine
Word

徹底

てってい
thoroughness; completeness; consistency; thorough enforcement; seeing to it that a policy, etc. is carried out without exception
Word

徹底的

てっていてき
thorough; complete
Word

基底

きてい
base; ground
Word

地底

ちてい
depths of the earth
Word

根底

根柢
こんてい
root; basis; foundation
Word

底面

ていめん
bottom; underside; base
Word

到底

adv
とうてい
(cannot) possibly; no matter how