prime mover vs causal agency

prime mover and causal agency both are nouns.

Word	Noun	Adjective	Verb	Adverb
prime mover	Yes	No	No	No
causal agency	Yes	No	No	No

As nouns, causal agency is a hypernym of prime mover; that is, causal agency is a word with a broader meaning than prime mover:

prime mover: an agent that is the cause of all things but does not itself have a cause
causal agency: any entity that produces an effect or is responsible for events or results

Other hypernyms of prime mover include causal agent, cause.

prime mover (noun)	causal agency (noun)
an agent that is the cause of all things but does not itself have a cause	any entity that produces an effect or is responsible for events or results