ductulus vs canal

ductulus and canal both are nouns.

Word	Noun	Adjective	Verb	Adverb
ductulus	Yes	No	No	No
canal	Yes	No	Yes	No

As nouns, canal is a hypernym of ductulus; that is, canal is a word with a broader meaning than ductulus:

ductulus: a very small duct
canal: a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance

Other hypernyms of ductulus include channel, duct, epithelial duct.

ductulus (noun)	canal (noun)
a very small duct	long and narrow strip of water made for boats or for irrigation
	a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance
	(astronomy) an indistinct surface feature of Mars once thought to be a system of channels; they are now believed to be an optical illusion

ductulus (verb)	canal (verb)
	provide (a city) with a canal