icterus neonatorum vs physiological jaundice of the newborn

icterus neonatorum and physiological jaundice of the newborn both are nouns.

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

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

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

Other synonyms of icterus neonatorum include jaundice of the newborn.

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