alizarine vs alizarin

alizarine and alizarin both are nouns.

Word	Noun	Adjective	Verb	Adverb
alizarine	Yes	No	No	No
alizarin	Yes	No	No	No

As nouns, alizarine and alizarin are synonyms defined as:

alizarine and alizarin: an orange-red crystalline compound used in making red pigments and in dyeing

alizarine (noun)	alizarin (noun)
an orange-red crystalline compound used in making red pigments and in dyeing	an orange-red crystalline compound used in making red pigments and in dyeing