primum mobile vs causal agency

primum mobile and causal agency both are nouns.

Word	Noun	Adjective	Verb	Adverb
primum mobile	Yes	No	No	No
causal agency	Yes	No	No	No

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

primum mobile: 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 primum mobile include causal agent, cause.

primum mobile (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