autobahn vs superhighway

autobahn and superhighway both are nouns.

Word	Noun	Adjective	Verb	Adverb
autobahn	Yes	No	No	No
superhighway	Yes	No	No	No

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

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

autobahn (noun)	superhighway (noun)
an expressway in a German-speaking country	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