throughway vs motorway

throughway and motorway both are nouns.

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

As nouns, throughway and motorway are synonyms defined as:

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

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

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