duty vs chore

duty and chore both are nouns.

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

As nouns, chore is a hyponym of duty; that is, chore is a word with a more specific, narrower meaning than duty:

duty: work that you are obliged to perform for moral or legal reasons
chore: a specific piece of work required to be done as a duty or for a specific fee

Other hyponyms of duty include job, task, function, office, part, role, assignment, duty assignment.

duty (noun)	chore (noun)
the social force that binds you to the courses of action demanded by that force	a specific piece of work required to be done as a duty or for a specific fee
work that you are obliged to perform for moral or legal reasons
a government tax on imports or exports