Keywords: work, job, employment, occupation, task, employed, function
As a Noun
An activity you do for which you are paid. English = work, job, employment, occupation.
Something that you need to do that requires some effort. English = work, task.
The useful thing that something or someone does or is intended to do. English = function.
As a Verb or Adjective
To do an activity for which you get paid. English = work, (be) employed.
To expend effort to do something that must be done. English = work.