tunnage vs tariff

tunnage and tariff both are nouns.

Word	Noun	Adjective	Verb	Adverb
tunnage	Yes	No	No	No
tariff	Yes	No	Yes	No

As nouns, tariff is a hypernym of tunnage; that is, tariff is a word with a broader meaning than tunnage:

tunnage: a tax imposed on ships that enter the US; based on the tonnage of the ship
tariff: a government tax on imports or exports

Other hypernyms of tunnage include duty.

tunnage (noun)	tariff (noun)
a tax imposed on ships that enter the US; based on the tonnage of the ship	a government tax on imports or exports

tunnage (verb)	tariff (verb)
	charge a tariff