The Collaborative International Dictionary of English v.0.48:

Educator \Ed"u*ca`tor\, n. [L.]
   One who educates; a teacher.
   [1913 Webster]

WordNet (r) 3.0 (2006):

educator
    n 1: someone who educates young people [syn: educator,
         pedagogue, pedagog]

Moby Thesaurus II by Grady Ward, 1.0:

28 Moby Thesaurus words for "educator":
   abecedarian, certified teacher, docent, doctor, dominie, don,
   educationist, fellow, guide, guru, instructor, maestro, master,
   melamed, mentor, mullah, pandit, pedagogist, pedagogue, preceptor,
   professor, pundit, rabbi, schoolkeeper, schoolmaster,
   schoolteacher, starets, teacher