snake oil vs misrepresentation

snake oil and misrepresentation both are nouns.

Word	Noun	Adjective	Verb	Adverb
snake oil	Yes	No	No	No
misrepresentation	Yes	No	No	No

As nouns, misrepresentation is a hypernym of snake oil; that is, misrepresentation is a word with a broader meaning than snake oil:

Other hypernyms of snake oil include deceit, deception.

snake oil (noun)	misrepresentation (noun)
communication (written or spoken) intended to deceive	a willful perversion of facts
(medicine) any of various liquids sold as medicine (as by a travelling medicine show) but medically worthless	a misleading falsehood