first cause vs prime mover

first cause and prime mover both are nouns.

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

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

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

Other synonyms of first cause include primum mobile.

first cause (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