Masterlines or Masterliness: How To spell?
The word Masterlines is misspelled against Masterliness, a noun meaning "The quality or state of being masterly; ability to control wisely or skillfully."
Masterliness 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:  masterline-s  Correct Spelling:  masterline-ss 
Find more wrongly spelled words of Masterliness to spell it well.