The word Taspoonfuls is misspelled against Teaspoonfuls, which is plural of "Teaspoonful"
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Teaspoonfuls has vowels 'ea' together mispronounced as 'a'
Word contains consecutive vowels 'EA' in between alphabets t & spoonfuls is misspelled as 'A'
Wrong Spelling:  t-a-spoonfuls 
Correct Spelling:  t-ea-spoonfuls 
Check more misspelled words of Teaspoonfuls to spell it correct.