primum mobile vs prime mover

primum mobile and prime mover both are nouns.

Word	Noun	Adjective	Verb	Adverb
primum mobile	Yes	No	No	No
prime mover	Yes	No	No	No

As nouns, primum mobile and prime mover are synonyms defined as:

primum mobile and prime mover: an agent that is the cause of all things but does not itself have a cause

Other synonyms of primum mobile include first cause.

primum mobile (noun)	prime mover (noun)
an agent that is the cause of all things but does not itself have a cause	an agent that is the cause of all things but does not itself have a cause