The word Numskul is misspelled against Numskull, a noun meaning "A dunce; a dolt; a stupid fellow."
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Numskull 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:  numsku-l 
Correct Spelling:  numsku-ll 
Check more misspelled words of Numskull to spell it correct.