Synonyms for Prime mover:

n.

authority figure, mogul, magnate, vip, figure, mover and shaker, eminence, a force to be reckoned with, leading light. prime mover (noun)
creator, Primum Mobile, author, first cause.
supreme being (noun)
creator, author.

Other synonyms:

authority figure, mover and shaker, author, leading light. mogul, eminence. figure. primum mobile
Primum Mobile.
Other relevant words:
creator, author.