I have a lot of work to do tomorrow How to distinguish job from work?

I have a lot of work to do tomorrow How to distinguish job from work?

How to distinguish between job and work? In middle school, it's OK to know that job is countable and work is not countable. Job is more specific and work is more abstract. In high school, add a work, work is construction engineering; Public Engineering (such as bridge, dam, dike, etc.) [plural] factory