bilirubin vs haematoidin

bilirubin and haematoidin both are nouns.

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

As nouns, bilirubin and haematoidin are synonyms defined as:

bilirubin and haematoidin: 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 hematoidin.

bilirubin (noun)	haematoidin (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