The Collaborative International Dictionary of English v.0.48:
Educationist \Ed`u*ca"tion*ist\, n. One who is versed in the theories of, or who advocates and promotes, education. Syn: educationalist. [1913 Webster]WordNet (r) 3.0 (2006):
educationist n 1: a specialist in the theory of education [syn: educationist, educationalist]