peddler vs seller

peddler and seller both are nouns.

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

As nouns, seller is a hypernym of peddler; that is, seller is a word with a broader meaning than peddler:

peddler: someone who travels about selling his wares (as on the streets or at carnivals)
seller: someone who promotes or exchanges goods or services for money

Other hypernyms of peddler include marketer, trafficker, vender, vendor.

peddler (noun)	seller (noun)
someone who travels about selling his wares (as on the streets or at carnivals)	someone who promotes or exchanges goods or services for money
an unlicensed dealer in illegal drugs