What is the difference between pleural effusion and pulmonary edema? where does the water accumulates in pul edema?

Location of fluid: In plural effusion the fluid accumulated in the plural cavity between lung and chest wall lining possible to remove this fluid , but pulmonary edema fluid accumulates in lung tissue like a sponge, most of the time due to right side of heat fail to clear the fluid, also called right hear failure, simply pump the heart is failing.

In vs around lung: To be technical, I have used exact wording published elsewhere, "pulmonary edema is an abnormal buildup of fluid in the air sacs of the lungs...Pleural effusion is a buildup of fluid between the layers of tissue that line the lungs and chest cavity". Really, in most simplistic terms "edema" is fluid within tissue. In context of the question, it is fluid within actual lung tissue.

Different Location: A pleural effusion is fluid around the lungs that collects between the lung and chest wall. Pulmonary edema is fluid that collects in the lung airspaces themselves. Many times, you can have both together. Both cause difficulty with breathing.