The answer to that question depends on the teacher.
A job is something that any person can do in order to make money to pay bills and purchase what they need to survive. There are jobs that provide goods and services, but I don't think most people plan to retire from a typical job. My first job was a hostess at a major restaurat chain, and it was just that, a job, something to do, a way to earn a little extra money. There is very little advancement in a typical job. However, there are those who have learned how to turn a job into a career.
A career has more to do with one's gifts, talents and passion. Careers required specialized training and those who have careers - whether in the food industry, in business, in the medical field, in education or in any other field - are constantly looking for ways to perfect their craft. There is always the opportunity for advancement, and they continue to improve themselves until they retire.
I am a teacher, and I believe teaching is a career and I treat it as such. However, I know people who think of teaching as a job - something for them to do right now, until something better and more fulfulling comes along.