胃腸[ichou] stomach
回腸[kaichou] ileum
結腸[kecchou] colon
鼓腸[kochou] flatulence
十二指腸[juunishichou] duodenum

十二指腸虫[juunishichouchuu] hookworm
大腸[daichou] large intestine
脱腸[dacchou] abdominal hernia
断腸[danchou] heartbreak
断腸の思い[danchounoomoi] heartbroken thoughts