ペン胼胝[pendako] callus on one's middle finger (from writing)
耳に胼胝ができる[miminitakogadekiru] to be told or made to hear something so often that you (metaphorically) get calluses on your ears
胼胝体[benchitai] corpus callosum

准胝観音[jundeikannon] Cundi (manifestation of Avalokitesvara)
座り胼胝[suwaridako] calluses (on one's ankles, insteps, etc.) caused by sitting seiza

出臍[debeso] protruding navel
膃肭臍[ottosei] fur seal (esp. the northern fur seal, Callorhinus ursinus)
お臍[oheso] navel
臍のゴマ[hesonogoma] belly-button lint
臍の緒[hesonoo] umbilical cord

臍下[seika] lower abdomen
臍下丹田[seikatanden] pit of the stomach
臍曲り[hesomagari] perverseness
臍繰り[hesokuri] secret savings
臍繰り金[hesokurigane] secret savings

尾骶骨[biteikotsu] coccyx