keeping vs duty

keeping and duty both are nouns.

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

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

keeping: the responsibility of a guardian or keeper
duty: the social force that binds you to the courses of action demanded by that force

Other hypernyms of keeping include obligation, responsibility.

keeping (noun)	duty (noun)
the responsibility of a guardian or keeper	the social force that binds you to the courses of action demanded by that force
conformity or harmony	work that you are obliged to perform for moral or legal reasons
the act of retaining something	a government tax on imports or exports