requirement vs duty

requirement and duty both are nouns.

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

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

requirement: something that is required in advance
duty: the social force that binds you to the courses of action demanded by that force

Other hypernyms of requirement include obligation, responsibility.

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

requirement: required activity
duty: the social force that binds you to the courses of action demanded by that force

Other hypernyms of requirement include obligation, responsibility.

requirement (noun)	duty (noun)
something that is required in advance	the social force that binds you to the courses of action demanded by that force
required activity	work that you are obliged to perform for moral or legal reasons
anything indispensable	a government tax on imports or exports