obscenity vs scatology

obscenity and scatology both are nouns.

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

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

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

Other hyponyms of obscenity include bawdry, bawdy.

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