throughway vs expressway

throughway and expressway both are nouns.

Word	Noun	Adjective	Verb	Adverb
throughway	Yes	No	No	No
expressway	Yes	No	No	No

As nouns, throughway and expressway are synonyms defined as:

throughway and expressway: a broad highway designed for high-speed traffic

Other synonyms of throughway include freeway, motorway, pike, state highway, superhighway, thruway.

throughway (noun)	expressway (noun)
a broad highway designed for high-speed traffic	a broad highway designed for high-speed traffic