Oftennes or Oftenness: How To spell?

The word Oftennes is misspelled against Oftenness, a noun meaning "Frequency."

Oftenness 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:  oftenne-s 
Correct Spelling:  oftenne-ss 
Explore spell check of Oftenness to spell without errors.

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