prime mover vs primum mobile

prime mover and primum mobile both are nouns.

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

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

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

Other synonyms of prime mover include first cause.

prime mover (noun)	primum mobile (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