crier vs town crier

crier and town crier both are nouns.

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

As nouns, crier and town crier are synonyms defined as:

crier and town crier: (formerly) an official who made public announcements

crier (noun)	town crier (noun)
(formerly) an official who made public announcements	(formerly) an official who made public announcements
a person who weeps
a peddler who shouts to advertise the goods he sells