Cafeine or Caffeine: How To spell?
The word Cafeine is misspelled against Caffeine, a noun meaning "A white, bitter, crystallizable substance, obtained from coffee. It is identical with the alkaloid theine from tea leaves, and with guaranine from guarana."
Caffeine has double "ff" is mispronounced as "f"Remember double 'FF' in between the strings Ca & eine which should not be misspelled with single 'F'
Wrong Spelling:  Ca-f-eine  Correct Spelling:  Ca-ff-eine 
Find more wrongly spelled words of Caffeine to spell it well.