御腹[onaka] stomach
異腹[ifuku] child of a different mother
一人腹[hitoribara] taking for granted
横っ腹[yokoppara] side
横腹[yokobara] side

下っ腹[shitappara] abdomen
下腹[kafuku] abdomen
瀉腹[kudaribara] diarrhoea
下腹部[kafukubu] abdomen
割腹[kappuku] disembowelment