Sliperness or Slipperness: How To spell?
The word Sliperness is misspelled against Slipperness, a noun meaning "Slipperiness."
Slipperness has double "pp" is mispronounced as "p"Remember double 'PP' in between the strings sli & erness which should not be misspelled with single 'P'
Wrong Spelling:  sli-p-erness  Correct Spelling:  sli-pp-erness 
Find more wrongly spelled words of Slipperness to spell it well.