Mastles or Mastless: How To spell?
The word Mastles is misspelled against Mastless, an adjective meaning "Bearing no mast; as, a mastless oak or beech."
Mastless 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:  mastle-s  Correct Spelling:  mastle-ss 
Explore spell check of Mastless to spell without errors.