hawker vs seller

hawker and seller both are nouns.

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

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

hawker: 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 hawker include marketer, trafficker, vender, vendor.

hawker (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
a person who breeds and trains hawks and who follows the sport of falconry