shipway vs ship canal

shipway and ship canal both are nouns.

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

As nouns, shipway and ship canal are synonyms defined as:

shipway (noun)	ship canal (noun)
structure consisting of a sloping way down to the water from the place where ships are built or repaired	a canal large enough for seagoing vessels
a canal large enough for seagoing vessels