motorway vs expressway

motorway and expressway both are nouns.

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

As nouns, motorway and expressway are synonyms defined as:

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

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

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