Compresion or Compression: How To spell?
The word Compresion is misspelled against Compression, a noun meaning "The act of compressing, or state of being compressed."
Compression has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings compre & ion which should not be misspelled with single 'S'
Wrong Spelling:  compre-s-ion  Correct Spelling:  compre-ss-ion 
Find more incorrect spellings of Compression to spell right way.