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Is there a rule governing when to use -gist or -gian (i.e.: Anthropologist vs. Theologian)?

More to the point i am curious as to whether or not there is a significant difference if i want to imply the professional study of a concept depending on which of these i choose. Do they carry separate distinctions? Why are there different usages for the field of the examples i provide in my question (anthropo-logist vs. theo-logian)?

Thank you