Billboard vs. Poster

Difference Between Billboard and Poster
Billboardnoun
A very large outdoor sign, generally used for advertising.
Posternoun
A picture of a celebrity, an event etc., intended to be attached to a wall.
He has posters of his favorite band, sports teams and holiday resorts up.Billboardnoun
(dated) A flat surface, such as a panel or fence, on which bills are posted; a bulletin board.
Posternoun
An advertisement to be posted on a pole, wall etc. to advertise something.
I saw a poster for the film on the side of a bus.Billboardnoun
(nautical) A piece of thick plank, armed with iron plates, and fixed on the bow or fore-channels of a vessel, for the bill or fluke of the anchor to rest on.
Posternoun
(internet) One who posts a message.
Some posters left the online message board after the squabble.Billboardnoun
(computer graphics) A sprite that always faces the screen, no matter which direction it is looked at from.
Posternoun
A shot that hits a goalpost instead of passing into the goal.
We got three posters in the third and lost.Billboardnoun
large outdoor signboard
Posternoun
(dated) A posthorse.
Posternoun
(archaic) A swift traveller; a courier.
Posterverb
(transitive) To decorate with posters.
to poster the walls of a bedroomPosternoun
a sign posted in a public place as an advertisement;
a poster advertised the coming attractionsPosternoun
someone who pastes up bills or placards on walls or billboards
Posternoun
a horse kept at an inn or post house for use by mail carriers or for rent to travelers