ruby vs deep red

ruby and deep red both are nouns.

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

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

Other synonyms of ruby include crimson.

ruby (noun)	deep red (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

ruby (adjective)	deep red (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