crier vs hawker

crier and hawker both are nouns.

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

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

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

Other hypernyms of crier include packman, peddler, pedlar, pitchman, bawler, bellower, roarer, screamer, screecher, shouter, yeller.

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