Words in similar meaning - Work, Job, Task

In business environment, we are familiar with serveral words relating to activity of doing something like 'work', 'job' and 'task': considering 3 words as noun. They are literally similar meaning as they are all meant to activities done by businessmen. To enhance our comprehension in particular, let's go through each specific meaning respectively.

"Work"
1.) activity directed toward making or doing something; "she checked several points needing further work".
2.) a product produced or accomplished through the effort or activity or agency of a person or thing; "it is not regarded as one of his more memorable works.", "the symphony was hailed as an ingenious work.", "he was indebted to the pioneering work of John Dewey", "the work of an active imagination.", "erosion is the work of wind or water over time".

"Job"
1.) the principal activity in your life that you do to earn money; "he's not in my line of business".
2.) a specific piece of work required to be done as a duty or for a specific fee; "estimates of the city's loss on that job ranged as high as a million dollars", "the job of reparing the engine took several hours".
3.) the performance of a piece of work; "she did an outstanding job as Ophelia.", "he gave it up a bad job."
4.) the responsibility to do something; "it is their job to print the truth."
5.) an object worked on; a result procuded by working; "he held the job in his left hand and worked on in with his right."

"Task"
1.) any piece of work that is undertaken or attempted; "he prepared for great undertakings."
2.) a specific piece of work required to be done as a duty or for a specifice fee.