The word Certainess is misspelled against Certainness, a noun meaning "Certainty."
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Certainness has double "nn" is mispronounced as "n"
Remember double 'NN' in between the strings certai & ess which should not be misspelled with single 'N'
Wrong Spelling: certai-n-ess
Correct Spelling: certai-nn-ess
Find more wrongly spelled words of Certainness to spell it well.