The word Tothbrush is misspelled against Toothbrush, a noun meaning "A brush for cleaning the teeth."
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Toothbrush has double "oo" is mispronounced as "o"
Remember double 'OO' in between the strings t & thbrush which should not be misspelled with single 'O'
Wrong Spelling:  t-o-thbrush 
Correct Spelling:  t-oo-thbrush 
Check more misspelled words of Toothbrush to spell it correct.