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Plasma has been derived from the word that means form or shape so plasma membrane means the membrane that gives shape or form to the cell. This is the reason that cell membrane is also called plasma membrane.
Most textbooks are likely to use the two terms interchangeably (as the outer membrane surrounding living cells), but you might find sources that say that the plasma membrane is the outer membrane (surrounding the cytoplasm), but both the plasma membrane and membranes surrounding organelles inside the cell are called cell membranes.