ruby vs crimson

ruby and crimson both are nouns.

Word	Noun	Adjective	Verb	Adverb
ruby	Yes	Yes	No	No
crimson	Yes	Yes	Yes	No

As adjectives, ruby and crimson are synonyms defined as:

ruby and crimson: of a color at the end of the color spectrum (next to orange); resembling the color of blood or cherries or tomatoes or rubies

Other synonyms of ruby include blood-red, carmine, cerise, cherry-red, cherry, red, reddish, ruby-red, ruddy, scarlet.

As nouns, ruby and crimson are synonyms defined as:

Other synonyms of ruby include deep red.

ruby (noun)	crimson (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)	crimson (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	characterized by violence or bloodshed
	of a color at the end of the color spectrum (next to orange); resembling the color of blood or cherries or tomatoes or rubies
	(especially of the face) reddened or suffused with or as if with blood from emotion or exertion

ruby (verb)	crimson (verb)
	turn red, as if in embarrassment or shame