is a specific kind of: passage, passageway.

is a broader term that covers: 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, GI tract | lactiferous duct ... show more.

has as a part: ampulla.

derivation: channel, channelise, channelize, transfer, transmit, transport.