tonnage vs tariff

tonnage and tariff both are nouns.

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

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

tonnage: 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 tonnage include duty.

tonnage (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

tonnage (verb)	tariff (verb)
	charge a tariff