causeway vs route

causeway and route both are nouns.

Word	Noun	Adjective	Verb	Adverb
causeway	Yes	No	Yes	No
route	Yes	No	Yes	No

As nouns, route is a hypernym of causeway; that is, route is a word with a broader meaning than causeway:

Other hypernyms of causeway include road.

causeway (noun)	route (noun)
a road that is raised above water or marshland or sand	an open way (generally public) for travel or transportation
	an established line of travel or access

causeway (verb)	route (verb)
pave a road with cobblestones or pebbles	send via a specific route
provide with a causeway	divert in a specified direction
	send documents or materials to appropriate destinations