poster color vs poster paint

poster color and poster paint both are nouns.

Word	Noun	Adjective	Verb	Adverb
poster color	Yes	No	No	No
poster paint	Yes	No	No	No

As nouns, poster color and poster paint are synonyms defined as:

poster color and poster paint: pigment mixed with water-soluble glutinous materials such as size and egg yolk

Other synonyms of poster color include poster colour, tempera.

poster color (noun)	poster paint (noun)
pigment mixed with water-soluble glutinous materials such as size and egg yolk	pigment mixed with water-soluble glutinous materials such as size and egg yolk