Difusion or Diffusion: How To spell?
The word Difusion is misspelled against Diffusion, meaning "Dispersion."
Diffusion has double "ff" is mispronounced as "f"Remember double 'FF' in between the strings Di & usion which should not be misspelled with single 'F'
Wrong Spelling:  Di-f-usion  Correct Spelling:  Di-ff-usion 
Check more misspelled words of Diffusion to spell it correct.