poster paint vs poster colour

poster paint and poster colour both are nouns.

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

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

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

Other synonyms of poster paint include poster color, tempera.

poster paint (noun)	poster colour (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