prime mover vs first cause

prime mover and first cause both are nouns.

Word	Noun	Adjective	Verb	Adverb
prime mover	Yes	No	No	No
first cause	Yes	No	No	No

As nouns, prime mover and first cause are synonyms defined as:

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

Other synonyms of prime mover include primum mobile.

prime mover (noun)	first cause (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