The word Nightfal is misspelled against Nightfall, a noun meaning "The close of the day."
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Nightfall has double 'll' in the end mispronounced as 'l'
Remember double 'LL' appears in the end of this word which should not be misspelled with single 'L'
Wrong Spelling:  nightfa-l 
Correct Spelling:  nightfa-ll 
Find more wrongly spelled words of Nightfall to spell it well.