toll road vs superhighway

toll road and superhighway both are nouns.

Word	Noun	Adjective	Verb	Adverb
toll road	Yes	No	No	No
superhighway	Yes	No	No	No

As nouns, superhighway is a hypernym of toll road; that is, superhighway is a word with a broader meaning than toll road:

Other hypernyms of toll road include expressway, freeway, motorway, pike, state highway, throughway, thruway.

toll road (noun)	superhighway (noun)
an expressway on which tolls are collected	a broad highway designed for high-speed traffic
	an extensive electronic network (such as the internet) used for the rapid transfer of sound and video and graphics in digital form