channel vs canal

channel and canal both are nouns.

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

As nouns, channel and canal are synonyms defined as:

channel and canal: a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance

Other synonyms of channel include duct, epithelial duct.

As nouns, canal is a hyponym of channel; that is, canal is a word with a more specific, narrower meaning than channel:

channel: a deep and relatively narrow body of water (as in a river or a harbor or a strait linking two larger bodies) that allows the best passage for vessels
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

Other hyponyms of channel include gut, rill, sound, strait, tideway, watercourse.

channel (noun)	canal (noun)
a way of selling a company's product either directly or via distributors	long and narrow strip of water made for boats or for irrigation
a passage for water (or other fluids) to flow through	a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance
a television station and its programs	(astronomy) an indistinct surface feature of Mars once thought to be a system of channels; they are now believed to be an optical illusion
a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance
a path over which electrical signals can pass
(often plural) a means of communication or access
a deep and relatively narrow body of water (as in a river or a harbor or a strait linking two larger bodies) that allows the best passage for vessels
a long narrow furrow cut either by a natural process (such as erosion) or by a tool (as e.g. a groove in a phonograph record)

channel (verb)	canal (verb)
send from one person or place to another	provide (a city) with a canal
direct the flow of
transmit or serve as the medium for transmission