scatology vs obscenity

scatology and obscenity both are nouns.

Word	Noun	Adjective	Verb	Adverb
scatology	Yes	No	No	No
obscenity	Yes	No	No	No

As nouns, obscenity is a hypernym of scatology; that is, obscenity is a word with a broader meaning than scatology:

scatology: a preoccupation with obscenity (especially that dealing with excrement or excretory functions)
obscenity: an offensive or indecent word or phrase

Other hypernyms of scatology include dirty word, filth, smut, vulgarism.

scatology (noun)	obscenity (noun)
(medicine) the chemical analysis of excrement (for medical diagnosis or for paleontological purposes)	an obscene act
a preoccupation with obscenity (especially that dealing with excrement or excretory functions)	the trait of behaving in an obscene manner
	an offensive or indecent word or phrase