The word Monosylable is misspelled against Monosyllable, meaning "A word of one syllable."
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Monosyllable has double "ll" is mispronounced as "l"
Remember double 'LL' in between the strings monosy & able which should not be misspelled with single 'L'
Wrong Spelling:  monosy-l-able 
Correct Spelling:  monosy-ll-able 
Find more incorrect spellings of Monosyllable to spell right way.