poster vs bill sticker

poster and bill sticker both are nouns.

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

As nouns, poster and bill sticker are synonyms defined as:

poster and bill sticker: someone who pastes up bills or placards on walls or billboards

Other synonyms of poster include bill poster.

poster (noun)	bill sticker (noun)
a horse kept at an inn or post house for use by mail carriers or for rent to travelers	someone who pastes up bills or placards on walls or billboards
a sign posted in a public place as an advertisement
someone who pastes up bills or placards on walls or billboards