countervailing duty vs duty

countervailing duty and duty both are nouns.

Word	Noun	Adjective	Verb	Adverb
countervailing duty	Yes	No	No	No
duty	Yes	No	No	No

As nouns, duty is a hypernym of countervailing duty; that is, duty is a word with a broader meaning than countervailing duty:

countervailing duty: a duty imposed to offset subsidies by foreign governments
duty: a government tax on imports or exports

Other hypernyms of countervailing duty include tariff.

countervailing duty (noun)	duty (noun)
a duty imposed to offset subsidies by foreign governments	the social force that binds you to the courses of action demanded by that force
	work that you are obliged to perform for moral or legal reasons
	a government tax on imports or exports