a job (countable, regular work a person does for a company)
work (uncountable, aktivity, usually for money)

visited
attended
worked

about
of
after

of
by
in

say
talk
tell

say
talk
told

wage
salary
income

job; in
work;for
work; in

employee
employment
employer

white-collar
blue-collar
red-collar

do you work
are you working
have you been working