Cachinatory or Cachinnatory: How To spell?
The word Cachinatory is misspelled against Cachinnatory, an adjective meaning "Consisting of, or accompanied by, immoderate laughter."
Cachinnatory has double "nn" is mispronounced as "n"Remember double 'NN' in between the strings cachi & atory which should not be misspelled with single 'N'
Wrong Spelling:  cachi-n-atory  Correct Spelling:  cachi-nn-atory 
Find more incorrect spellings of Cachinnatory to spell right way.