vulgarism vs scatology

vulgarism and scatology both are nouns.

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

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

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

Other hyponyms of vulgarism include bawdry, bawdy.

vulgarism (noun)	scatology (noun)
the quality of lacking taste and refinement	(medicine) the chemical analysis of excrement (for medical diagnosis or for paleontological purposes)
an offensive or indecent word or phrase	a preoccupation with obscenity (especially that dealing with excrement or excretory functions)