expressway vs freeway

expressway and freeway both are nouns.

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

As nouns, expressway and freeway are synonyms defined as:

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

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