red brass vs guinea gold

red brass and guinea gold both are nouns.

Word	Noun	Adjective	Verb	Adverb
red brass	Yes	No	No	No
guinea gold	Yes	No	No	No

As nouns, red brass and guinea gold are synonyms defined as:

red brass and guinea gold: brass with enough copper to give it a reddish tint; used for plumbing pipe and other brass hardware and in cheap jewelry

red brass (noun)	guinea gold (noun)
brass with enough copper to give it a reddish tint; used for plumbing pipe and other brass hardware and in cheap jewelry	brass with enough copper to give it a reddish tint; used for plumbing pipe and other brass hardware and in cheap jewelry
	22-karat gold from which guinea coins were made