Saint Lawrence Seaway vs trade route

Saint Lawrence Seaway and trade route both are nouns.

Word	Noun	Adjective	Verb	Adverb
Saint Lawrence Seaway	Yes	No	No	No
trade route	Yes	No	No	No

Saint Lawrence Seaway (noun)	trade route (noun)
a seaway involving the Saint Lawrence River and the Great Lakes that was developed jointly by Canada and the United States; oceangoing ships can travel as far west as Lake Superior	a lane at sea that is a regularly used route for vessels
	a route followed by traders (usually in caravans)