canal boat vs narrow boat

canal boat and narrow boat both are nouns.

Word	Noun	Adjective	Verb	Adverb
canal boat	Yes	No	No	No
narrow boat	Yes	No	No	No

As nouns, canal boat and narrow boat are synonyms defined as:

canal boat and narrow boat: a long boat that carries freight and is narrow enough to be used in canals

Other synonyms of canal boat include narrowboat.

canal boat (noun)	narrow boat (noun)
a long boat that carries freight and is narrow enough to be used in canals	a long boat that carries freight and is narrow enough to be used in canals