Те,кто ЗНАЕТ английский,пожалуйста помогите. объясните разницу между job и work join и unit

JOB

[countable noun] the work that you do regularly in order to earn money, especially when you work for an employer

My first job was in a record store.

Daniel starts his new job on Monday.

She has a well-paid job in the tax department.
get a job

Ted got a job as a bartender.
find a job
(=get a job after trying to get a lot of different jobs)

Her son still hasn't been able to find a job.
look for a job
(=try to get one)

She's looking for a job in the music business.
hold a job
(=have a job)

If a woman is qualified, she should hold any job in government she wants.
part-time job
(=when you work less than the usual number of hours each week)

I had a part-time job while I was in college.
job losses/job cuts
(=when a lot of people lose their jobs)

The company announced 74,000 job cuts and 21 factory closures.

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WORK

[uncountable noun] work that someone does regularly to earn money, either by working for an employer or working for themselves

My father started work when he was 14.

Most people stop work when they are 65.

I usually start work each day around 9 am and finish about 6 pm.

The work's really interesting but the pay's lousy.
look for work
(=to try to get work)

Lena graduated from college six months ago and she's still looking for work.
find work
(=to get work)

He eventually found work as a labourer on a construction site.
return to work/go back to work
(=to start work again after several weeks, months, or years)

Women often return to work after they have had children.

His injuries have made it impossible for him to go back to work.
at work
(=at the place where you work)

Her mother tried to call her at home and then at work.
to work
(=to the place where you work)

Alexander commutes 30 miles to work each day.
after/before work
(=before you start or after you finish your work each day)

They sometimes play tennis after work.

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Взято из Longman Activator.
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PS. Приведите предложение, где вы путаете join и unit.

Здравствуйте. Job -рабочее место, а work-то, чо Вы на нём делаете.
Join -сцепка, unit взаимное объединение составных частей.