The word Windfal is misspelled against Windfall, a noun meaning "An unexpected legacy, or other gain."
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Windfall 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:  windfa-l 
Correct Spelling:  windfa-ll 
Find more wrongly spelled words of Windfall to spell it well.