hawker vs crier

hawker and crier both are nouns.

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

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

hawker: someone who travels about selling his wares (as on the streets or at carnivals)
crier: a peddler who shouts to advertise the goods he sells

Other hyponyms of hawker include chapman, cheapjack, muffin man, sandboy, transmigrante.

hawker (noun)	crier (noun)
someone who travels about selling his wares (as on the streets or at carnivals)	(formerly) an official who made public announcements
a person who breeds and trains hawks and who follows the sport of falconry	a person who weeps
	a peddler who shouts to advertise the goods he sells