Brazilian students of English sometimes find it hard to distinguish between the words job and work. The difference, however, is very simple to grasp. Check it out:
1. A job is something a person does regularly in order to earn money. If you want somebody to employ you, you can say you are looking for a job. A job is also a particular task you have to do, like cleaning or writing an e-mail.
A local school offered me a job.
If I didn’t have all these posts to write, I could get so many other jobs done. 
2. Work is similar to job in that you also do it regularly, and get paid to do it. You can also say you are looking for work if you want somebody to employ you. However, unlike job, work is an uncount noun, and is also used as a verb. Work is also the various jobs you have to do, especially things you do not enjoy doing.
I thought everyone would have a job, and that I’d find work easily.
A housewife’s work can take 8 or 9 hours a day.
He was working at a bank.
