peddler vs cheapjack

peddler and cheapjack both are nouns.

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

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

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

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

peddler (noun)	cheapjack (noun)
someone who travels about selling his wares (as on the streets or at carnivals)	a peddler of inferior goods
an unlicensed dealer in illegal drugs

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