Occupation= (1) a person’s occupation, work, or trade: ‘She is thinking to change his occupation and become a writer.’ (2) the state of being held or possessed: ‘The office is ready for occupation.’ ‘Occupation of a building without a certificate of occupancy is illegal.’
Job = a specific piece of work required to be done as a duty or for a specific fee: ‘It used to be difficult for women to get good jobs.’ ‘The important thing is to be happy in your job.’
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Occupation and Job have similar meaning but occupation is mainly used in formal and official styles.