Relatednes or Relatedness: How To spell?
The word Relatednes is misspelled against Relatedness, a noun meaning "The state or condition of being related; relationship; affinity."
Relatedness 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:  relatedne-s  Correct Spelling:  relatedne-ss 
Explore spell check of Relatedness to spell without errors.