cultus vs cargo cult

cultus and cargo cult both are nouns.

Word	Noun	Adjective	Verb	Adverb
cultus	Yes	No	No	No
cargo cult	Yes	No	No	No

As nouns, cargo cult is a hyponym of cultus; that is, cargo cult is a word with a more specific, narrower meaning than cultus:

cultus: a system of religious beliefs and rituals
cargo cult: a religious cult that anticipates a time of joy, serenity, and justice when salvation comes

Other hyponyms of cultus include macumba, obeah, obi, Rastafarianism, hoodooism, vodoun, voodoo, voodooism, sabianism.

cultus (noun)	cargo cult (noun)
a system of religious beliefs and rituals	a religious cult that anticipates a time of joy, serenity, and justice when salvation comes
	(Melanesia) the followers of one of several millenarian cults that believe salvation will come in the form of wealth (`cargo') brought by westerners; some ascribe divine attributes to westerners on first contact (especially to missionaries)