The word Uterable is misspelled against Utterable, an adjective meaning "Capable of being uttered."
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Utterable has double "tt" is mispronounced as "t"
Remember double 'TT' in between the strings u & erable which should not be misspelled with single 'T'
Wrong Spelling:  u-t-erable 
Correct Spelling:  u-tt-erable 
Explore spell check of Utterable to spell without errors.