Smoothnes or Smoothness: How To spell?
The word Smoothnes is misspelled against Smoothness, a noun meaning "Quality or state of being smooth."
Smoothness 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:  smoothne-s  Correct Spelling:  smoothne-ss 
Find more incorrect spellings of Smoothness to spell right way.