peddler vs muffin man

peddler and muffin man both are nouns.

Word	Noun	Adjective	Verb	Adverb
peddler	Yes	No	No	No
muffin man	Yes	No	No	No

As nouns, muffin man is a hyponym of peddler; that is, muffin man 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)
muffin man: formerly an itinerant peddler of muffins

Other hyponyms of peddler include chapman, cheapjack, crier, sandboy, transmigrante.

peddler (noun)	muffin man (noun)
someone who travels about selling his wares (as on the streets or at carnivals)	formerly an itinerant peddler of muffins
an unlicensed dealer in illegal drugs