poster colour vs British spelling

poster colour and British spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
poster colour	Yes	No	No	No
British spelling	Yes	No	No	No

poster colour (noun)	British spelling (noun)
pigment mixed with water-soluble glutinous materials such as size and egg yolk	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')