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