cause of death vs causal agency

cause of death and causal agency both are nouns.

Word	Noun	Adjective	Verb	Adverb
cause of death	Yes	No	No	No
causal agency	Yes	No	No	No

As nouns, causal agency is a hypernym of cause of death; that is, causal agency is a word with a broader meaning than cause of death:

cause of death: the causal agent resulting in death
causal agency: any entity that produces an effect or is responsible for events or results

Other hypernyms of cause of death include causal agent, cause.

cause of death (noun)	causal agency (noun)
the causal agent resulting in death	any entity that produces an effect or is responsible for events or results