Libretist or Librettist: How To spell?
The word Libretist is misspelled against Librettist, a noun meaning "One who makes a libretto."
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.