hematoidin vs bilirubin

hematoidin and bilirubin both are nouns.

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

As nouns, hematoidin and bilirubin are synonyms defined as:

hematoidin and bilirubin: 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 hematoidin include haematoidin.

hematoidin (noun)	bilirubin (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