The best replacement for plasma membrane is cell membrane.

The best alternatives to plasma membrane are rated as following:
★★★★★  cell membrane
★★★  cell wall
★  nuclear membrane
★  cytoplasm
  cytoplasmic membrane
  intracellular membrane
  membrane
  within the cell
  lipid bilayer
  glomerular basement membrane

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Speaking about plasma membrane, one probably shouldn't forget about plasma membrane.

Other search terms related to plasma membrane and their ratings are:
★★★★★ plasma membrane
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plasma membrane
cell membrane
cell wall