Ordain vs Ordinator - What's the difference?

As a verb ordain

is to prearrange unalterably.

one who ordains or establishes; a director.

to prearrange unalterably

to decree

to admit into the ministry of a religion, for example as a priest, bishop, minister or Buddhist monk.

to authorize as a rabbi

to predestine

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(en noun)

One who ordains or establishes; a director.

(Webster 1913) ----