crimson vs ruby

crimson and ruby both are nouns.

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

As adjectives, crimson and ruby are synonyms defined as:

crimson and ruby: 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 crimson include blood-red, carmine, cerise, cherry-red, cherry, red, reddish, ruby-red, ruddy, scarlet.

As nouns, crimson and ruby are synonyms defined as:

Other synonyms of crimson include deep red.

crimson (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

crimson (adjective)	ruby (adjective)
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
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

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