The word Tuf is misspelled against Tuff, a noun meaning "Same as Tufa."
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Tuff has double 'ff' in the end mispronounced as 'f'
Remember double 'FF' appears in the end of this word which should not be misspelled with single 'F'
Wrong Spelling:  tu-f 
Correct Spelling:  tu-ff 
Check more misspelled words of Tuff to spell it correct.