hoodoo vs hoodooism

hoodoo and hoodooism both are nouns.

Word	Noun	Adjective	Verb	Adverb
hoodoo	Yes	No	Yes	No
hoodooism	Yes	No	No	No

As nouns, hoodooism is a hypernym of hoodoo; that is, hoodooism is a word with a broader meaning than hoodoo:

hoodoo: a practitioner of voodoo
hoodooism: a religious cult practiced chiefly in Caribbean countries (especially Haiti); involves witchcraft and animistic deities

Other hypernyms of hoodoo include vodoun, voodoo, voodooism, non-Christian priest, priest.

hoodoo (noun)	hoodooism (noun)
a charm superstitiously believed to embody magical powers	a religious cult practiced chiefly in Caribbean countries (especially Haiti); involves witchcraft and animistic deities
something believed to bring bad luck
a practitioner of voodoo
(geology) a column of weathered and unusually shaped rock

hoodoo (verb)	hoodooism (verb)
bring bad luck; be a source of misfortune