packman vs crier

packman and crier both are nouns.

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

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

packman: 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 packman include chapman, cheapjack, muffin man, sandboy, transmigrante.

packman (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 weeps
	a peddler who shouts to advertise the goods he sells