Disimilarity or Dissimilarity: How To spell?
The word Disimilarity is misspelled against Dissimilarity, a noun meaning "Want of resemblance; unlikeness; dissimilitude; variety; as, the dissimilarity of human faces and forms."
Dissimilarity has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings di & imilarity which should not be misspelled with single 'S'
Wrong Spelling:  di-s-imilarity  Correct Spelling:  di-ss-imilarity 
Find more wrongly spelled words of Dissimilarity to spell it well.