bill poster vs worker

bill poster and worker both are nouns.

Word	Noun	Adjective	Verb	Adverb
bill poster	Yes	No	No	No
worker	Yes	No	No	No

As nouns, worker is a hypernym of bill poster; that is, worker is a word with a broader meaning than bill poster:

bill poster (noun)	worker (noun)
someone who pastes up bills or placards on walls or billboards	sterile member of a colony of social insects that forages for food and cares for the larvae
	a person who works at a specific occupation
	a member of the working class (not necessarily employed)
	a person who acts and gets things done