deep red vs ruby

deep red and ruby both are nouns.

Word	Noun	Adjective	Verb	Adverb
deep red	Yes	No	No	No
ruby	Yes	Yes	No	No

As nouns, deep red and ruby are synonyms defined as:

Other synonyms of deep red include crimson.

deep red (noun)	ruby (noun)
a deep and vivid red color	a deep and vivid red color
	a transparent piece of ruby that has been cut and polished and is valued as a precious gem
	a transparent deep red variety of corundum; used as a gemstone and in lasers

deep red (adjective)	ruby (adjective)
	of a color at the end of the color spectrum (next to orange); resembling the color of blood or cherries or tomatoes or rubies