icterus neonatorum vs jaundice of the newborn

icterus neonatorum and jaundice of the newborn both are nouns.

Word	Noun	Adjective	Verb	Adverb
icterus neonatorum	Yes	No	No	No
jaundice of the newborn	Yes	No	No	No

As nouns, icterus neonatorum and jaundice of the newborn are synonyms defined as:

icterus neonatorum and jaundice of the newborn: yellowish appearance in newborn infants; usually subsides spontaneously

Other synonyms of icterus neonatorum include physiological jaundice of the newborn.

icterus neonatorum (noun)	jaundice of the newborn (noun)
yellowish appearance in newborn infants; usually subsides spontaneously	yellowish appearance in newborn infants; usually subsides spontaneously