job vs duty

job and duty both are nouns.

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

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

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

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

job: the responsibility to do something
duty: the social force that binds you to the courses of action demanded by that force

Other hypernyms of job include obligation, responsibility.

job (noun)	duty (noun)
the principal activity in your life that you do to earn money	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 crime (especially a robbery)	a government tax on imports or exports
a damaging piece of work
the responsibility to do something
the performance of a piece of work
a workplace; as in the expression `on the job'
an object worked on; a result produced by working
(computer science) a program application that may consist of several steps but is a single logical unit
a state of difficulty that needs to be resolved

job (verb)	duty (verb)
invest at a risk
work occasionally
profit privately from public office and official business
arranged for contracted work to be done by others