expressway vs thruway

expressway and thruway both are nouns.

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

As nouns, expressway and thruway are synonyms defined as:

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

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