The word Nightles is misspelled against Nightless, an adjective meaning "Having no night."
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Nightless 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:  nightle-s 
Correct Spelling:  nightle-ss 
Find more wrongly spelled words of Nightless to spell it well.