causation vs compulsion

causation and compulsion both are nouns.

Word	Noun	Adjective	Verb	Adverb
causation	Yes	No	No	No
compulsion	Yes	No	No	No

As nouns, compulsion is a hyponym of causation; that is, compulsion is a word with a more specific, narrower meaning than causation:

Other hyponyms of causation include sending, induction, initiation, trigger, coercion, influence, inducement, inducing.

causation (noun)	compulsion (noun)
the act of causing something to happen	using force to cause something to occur
	an irrational motive for performing trivial or repetitive actions, even against your will
	an urge to do or say something that might be better left undone or unsaid