alizarin crimson vs alizarin carmine

alizarin crimson and alizarin carmine both are nouns.

Word	Noun	Adjective	Verb	Adverb
alizarin crimson	Yes	No	No	No
alizarin carmine	Yes	No	No	No

As nouns, alizarin crimson and alizarin carmine are synonyms defined as:

alizarin crimson and alizarin carmine: any of various acid dyes; used for dyeing wool scarlet red

Other synonyms of alizarin crimson include alizarin red.

alizarin crimson (noun)	alizarin carmine (noun)
any of various acid dyes; used for dyeing wool scarlet red	any of various acid dyes; used for dyeing wool scarlet red