scatology vs vulgarism

scatology and vulgarism both are nouns.

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

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

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

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

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