O.K., to be honest, I'm not %100 sure what you are asking. Are you asking whether the words "pressure" and "stress" have similar meanings? Are you wanting to know whether the word pressure can be used in examples 1 and 2? If so, here is my answer. In my opinion, pressure can be used in those sentences. When one thinks of pressure, one thinks of a feeling of stress. I would say the building pressures of work can cause a person to feel stressed, therefore I might say I take yoga to relieve those pressures and become less stressed. Here is a correction of your sentences: 1.relieve the pressure: He insists that on occasion, people do yoga and like activities that relieve the pressure of their work. 2.release the working pressure (The opening of this sentence is a fragment, so I will add a few words.) It will increase the salary and welfare for outsourcing employees and help to increase their business abilities, thereby releasing their working pressure.

The pressure of work leads to stress which a person may find relief from through the healing power of yoga. The pressure of a demanding work load can be relieved through outsourcing some of the duties. Both of these (a pressure of a person internally or an external pressure of work on a group) are fine when carefully written.