This book was written in 1973, and language has certainly changed quite a bit in the last 30 years. I don't think teachers are being replaced by educators, and I don't remember many teachers who consistently used large words. Of course, it could just be I heard those words and knew what they meant, when an averagely lexiconed student could not.
"In schools today, the educators (Latin-derived) hold sway over the ordinary teachers (Anglo-Saxon). Educators speak a Latinate language, incomprehensible to parents and children alike, which is disparagingly referred to by those within the profession as "Pedaguese" or "Educanto." -- Peter Farb, Word Play