bilirubin vs hematoidin

bilirubin and hematoidin both are nouns.

Word	Noun	Adjective	Verb	Adverb
bilirubin	Yes	No	No	No
hematoidin	Yes	No	No	No

As nouns, bilirubin and hematoidin are synonyms defined as:

bilirubin and hematoidin: an orange-yellow pigment in the bile that forms as a product of hemoglobin; excess amounts in the blood produce the yellow appearance observed in jaundice

Other synonyms of bilirubin include haematoidin.

bilirubin (noun)	hematoidin (noun)
an orange-yellow pigment in the bile that forms as a product of hemoglobin; excess amounts in the blood produce the yellow appearance observed in jaundice	an orange-yellow pigment in the bile that forms as a product of hemoglobin; excess amounts in the blood produce the yellow appearance observed in jaundice