Thicknes or Thickness: How To spell?
The word Thicknes is misspelled against Thickness, a noun meaning "The quality or state of being thick (in any of the senses of the adjective)."
Thickness has double 'ss' in the end mispronounced as 's'Remember double 'SS' appears in the end of this word which should not be misspelled with single 'S'
Wrong Spelling:  thickne-s  Correct Spelling:  thickne-ss 
Find more wrongly spelled words of Thickness to spell it well.