epithelial duct vs GI tract

Other hyponyms of epithelial duct include pore, canalis vertebralis, spinal canal, vertebral canal, ductule, ductulus, canaliculus, canal of Schlemm, Schlemm's canal, sinus venosus sclerae, sinus, venous sinus, lachrymal duct, lacrimal duct, tear duct, nasolacrimal duct, Haversian canal, hepatic duct, canalis inguinalis, inguinal canal, bile duct, common bile duct, pancreatic duct, lymph vessel, lymphatic vessel, salivary duct, aqueductus cerebri, cerebral aqueduct, Sylvian aqueduct, ureter, urethra, canalis cervicis uteri, cervical canal, umbilical, umbilical cord, vagina, epididymis, ductus deferens, vas deferens, seminal duct, ejaculatory duct, cartilaginous tube, bronchiole, alimentary canal, alimentary tract, digestive tract, digestive tube, gastrointestinal tract, lactiferous duct.