While both an accountant and an auditor are responsible for the accounting processes of a company, there are some differences between the two professions.
An accountant is usually an employee of the company for which they work, and the work done by an accountant is done on a daily basis.
An auditor, on the other hand, is responsible for reviewing the work of the accountant on a quarterly or annual basis, and is often hired from an outside firm to do so.
In summary, an accountant will create the financial statements for the company, and the auditor will look the financial statements over to make sure they are accurate.