British spelling vs poster colour

British spelling and poster colour both are nouns.

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

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