English learners often find it difficult to know when to use 'job' and when to use 'work'.

JOB  

JOB generally refers to a function or position.

• Julie went to Japan and got a job as an English teacher.
• About 150 jobs will be created in the new industrial zone.
• Emily is an events manager. She loves her job.
• John is out of work at the moment. He’s busy applying for jobs.
• You'll need a well-paid job if you want to live in central London.

A job can also be a task, an assignment or a chore.

• I had a hard job removing the stains.
• Charlie! It's your job to mow the lawn!
• Stop interrupting her. Let her get on with the job!

Job is a countable noun. A person can have one job or several jobs.

• Bob took on a second job because he needed more money.
• I'm too busy to come with you. There are a few jobs I need to finish.

A job can be full-time or part-time, temporary or permanent.

Expressions with the word 'job' :

• You did a good / great job! → You succeeded in doing something well
.
• It's a good job Tom heard the customer complaining.→ Luckily Tom heard the customer.
• A plum job → A well-paid job that is considered relatively easy.

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WORK  

WORK refers to mental or physical activity.

• Emily works very hard. She has a lot of work to do.
• John is looking forward to going back to work/to working again.
• There's a lot of work to be done to the old house.

Work is both a verb and an uncountable noun.

• Bob works in the oil industry.
• Many people apply for work in his company. (not: a work).
• Work on the project has not yet begun.

'Work' can also refer to the place where you do your job.

• Where’s Dad? He’s at work.
• He arrives at work at 9 o'clock every morning.
• It is advisable not to make personal calls at work.
• I'll buy some food on my way home from work.

Expressions with the word 'work' :

• Work like a charm (be very effective).
  → I cleaned it with vinegar and it worked like a charm!
• Work your fingers to the bone (work very hard).
  → He worked his fingers to the bone to have everything ready on time.