pitchman vs cheapjack

pitchman and cheapjack both are nouns.

Word	Noun	Adjective	Verb	Adverb
pitchman	Yes	No	No	No
cheapjack	Yes	Yes	No	No

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

pitchman: someone who travels about selling his wares (as on the streets or at carnivals)
cheapjack: a peddler of inferior goods

Other hyponyms of pitchman include chapman, crier, muffin man, sandboy, transmigrante.

pitchman (noun)	cheapjack (noun)
someone who travels about selling his wares (as on the streets or at carnivals)	a peddler of inferior goods
an aggressive salesman who uses a fast line of talk to sell something

pitchman (adjective)	cheapjack (adjective)
	made of inferior workmanship and materials