Improvisatrice or Improvvisatrice: How To spell?
The word Improvisatrice is misspelled against Improvvisatrice, a noun meaning "A female improvvisatore."
Improvvisatrice has double "vv" is mispronounced as "v"Remember double 'VV' in between the strings impro & isatrice which should not be misspelled with single 'V'
Wrong Spelling:  impro-v-isatrice  Correct Spelling:  impro-vv-isatrice 
Find more incorrect spellings of Improvvisatrice to spell right way.