Suplementary or Supplementary: How To spell?
The word Suplementary is misspelled against Supplementary, an adjective meaning "Added to supply what is wanted; additional; being, or serving as, a supplement; as, a supplemental law; a supplementary sheet or volume."
Supplementary has double "pp" is mispronounced as "p"Remember double 'PP' in between the strings su & lementary which should not be misspelled with single 'P'
Wrong Spelling:  su-p-lementary  Correct Spelling:  su-pp-lementary 
Check more misspelled words of Supplementary to spell it correct.