The word Libretist is misspelled against Librettist, a noun meaning "One who makes a libretto."
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Librettist has double "tt" is mispronounced as "t"
Remember double 'TT' in between the strings libre & ist which should not be misspelled with single 'T'
Wrong Spelling: libre-t-ist
Correct Spelling: libre-tt-ist
Find more wrongly spelled words of Librettist to spell it well.