pedlar vs muffin man

pedlar and muffin man both are nouns.

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

As nouns, muffin man is a hyponym of pedlar; that is, muffin man is a word with a more specific, narrower meaning than pedlar:

pedlar: 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 pedlar include chapman, cheapjack, crier, sandboy, transmigrante.

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