expressway vs motorway

expressway and motorway both are nouns.

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

As nouns, expressway and motorway are synonyms defined as:

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

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

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