canal vs ship canal

canal and ship canal both are nouns.

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

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

Other hyponyms of canal include cut, industrial watercourse, race, raceway, shipway.

canal (noun)	ship canal (noun)
long and narrow strip of water made for boats or for irrigation	a canal large enough for seagoing vessels
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

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