• 大腸だいちょう — large intestine
• 小腸しょうちょう — small intestine
• 腸炎ちょうえん — enteritis (intestinal inflammation)
• 腸内細菌ちょうないさいきん — gut bacteria
• 盲腸もうちょう — appendix
• 腸管ちょうかん — intestinal tract

腸 is made from the 肉 (⺼, flesh) radical and the phonetic part 昜 (ヨウ/チョウ), which suggests the reading. Together, the form represents the idea of elongated internal organs, particularly the intestines.