Disasimilative or Disassimilative: How To spell?
The word Disasimilative is misspelled against Disassimilative, an adjective meaning "Having power to disassimilate; of the nature of disassimilation."
Disassimilative has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings disa & imilative which should not be misspelled with single 'S'
Wrong Spelling:  disa-s-imilative  Correct Spelling:  disa-ss-imilative 
Find more wrongly spelled words of Disassimilative to spell it well.