The best replacement for professor is doctor.

The best alternatives to professor are rated as following:
★★★★★  doctor
★★★★  instructor
★★★★  teacher
★★★  professor
★★★  associate professor
★★★  lecturer
★★  dr
★★  assistant professor
★  hobo
★  student
★  high school teacher
★  prof
★  homeless man
  clinical professor
  hoogleraar
  associate
  doctor title
  student einstein
  christian student
  researcher
  bum
  dr title
  adjunct professor
  professor emeritus
  formador
  tutor
  hot sauce
  doctor higher
  massive attack
  reader
  adjunct instructor
  doctor difference
  einstein
  aluno
  dean

Your alternative for professor is not listed? Suggest!
Speaking about professor, one probably shouldn't forget about research.

Other search terms related to professor and their ratings are:
★★★★★ research
★★★ postdoc
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Google Trends

Scale is based on the average worldwide traffic of professor in all years. Click on graph for more.
professor
doctor
instructor