Nouns

(n)canal(astronomy) an indistinct surface feature of Mars once thought to be a system of channels; they are now believed to be an optical illusion
(n)duct, epithelial duct, canal, channela bodily passage or tube lined with epithelial cells and conveying a secretion or other substance“the tear duct was obstructed”, “the alimentary canal”, “poison is released through a channel in the snake's fangs”
(n)canallong and narrow strip of water made for boats or for irrigation

Verbs

(v)canal, canalize, canaliseprovide (a city) with a canal