tempera vs poster color

tempera and poster color both are nouns.

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

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

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

Other synonyms of tempera include poster colour, poster paint.

tempera (noun)	poster color (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