Hipopotamuses or Hippopotamuses: How To spell?
The word Hipopotamuses is misspelled against Hippopotamuses, which is plural of "Hippopotamus"
Hippopotamuses has double "pp" is mispronounced as "p"Remember double 'PP' in between the strings hi & opotamuses which should not be misspelled with single 'P'
Wrong Spelling:  hi-p-opotamuses  Correct Spelling:  hi-pp-opotamuses 
Check more misspelled words of Hippopotamuses to spell it correct.