Scholmistress or Schoolmistress: How To spell?
The word Scholmistress is misspelled against Schoolmistress, a noun meaning "A woman who governs and teaches a school; a female school-teacher."
Schoolmistress has double "oo" is mispronounced as "o"Remember double 'OO' in between the strings sch & lmistress which should not be misspelled with single 'O'
Wrong Spelling:  sch-o-lmistress  Correct Spelling:  sch-oo-lmistress 
Find more incorrect spellings of Schoolmistress to spell right way.