The word Sournes is misspelled against Sourness, a noun meaning "The quality or state of being sour."
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Sourness 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:  sourne-s 
Correct Spelling:  sourne-ss 
Check more misspelled words of Sourness to spell it correct.