seaway vs trade route

seaway and trade route both are nouns.

Word	Noun	Adjective	Verb	Adverb
seaway	Yes	No	No	No
trade route	Yes	No	No	No

As nouns, seaway and trade route are synonyms defined as:

seaway and trade route: a lane at sea that is a regularly used route for vessels

Other synonyms of seaway include sea lane, ship route.

seaway (noun)	trade route (noun)
a lane at sea that is a regularly used route for vessels	a lane at sea that is a regularly used route for vessels
	a route followed by traders (usually in caravans)