obviation vs prevention

obviation and prevention both are nouns.

Word	Noun	Adjective	Verb	Adverb
obviation	Yes	No	No	No
prevention	Yes	No	No	No

As nouns, prevention is a hypernym of obviation; that is, prevention is a word with a broader meaning than obviation:

obviation: the act of preventing something by anticipating and disposing of it effectively
prevention: the act of preventing

Other hypernyms of obviation include bar.

obviation (noun)	prevention (noun)
the act of preventing something by anticipating and disposing of it effectively	the act of preventing