Other contributors have said "Is selectively permeable the same as semi-permeable?" is the same question as "What is the difference between selectively permeable and semi permeable?" If you believe that these are not asking the same thing and should be answered differently, click here
What is the difference between selectively permeable and semi permeable?
the differences is that semi- permeable only lets in and out molecules small enough to fit threw period selectively permeable has channel proteins that allow bigger molecules to fit threw.