thruway vs motorway

thruway and motorway both are nouns.

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

As nouns, thruway and motorway are synonyms defined as:

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

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