deus ex machina vs causal agent

deus ex machina and causal agent both are nouns.

Word	Noun	Adjective	Verb	Adverb
deus ex machina	Yes	No	No	No
causal agent	Yes	No	No	No

As nouns, causal agent is a hypernym of deus ex machina; that is, causal agent is a word with a broader meaning than deus ex machina:

deus ex machina: any active agent who appears unexpectedly to solve an insoluble difficulty
causal agent: any entity that produces an effect or is responsible for events or results

Other hypernyms of deus ex machina include causal agency, cause.

deus ex machina (noun)	causal agent (noun)
any active agent who appears unexpectedly to solve an insoluble difficulty	any entity that produces an effect or is responsible for events or results