pediatrist vs pediatrician

pediatrist and pediatrician both are nouns.

Word	Noun	Adjective	Verb	Adverb
pediatrist	Yes	No	No	No
pediatrician	Yes	No	No	No

As nouns, pediatrist and pediatrician are synonyms defined as:

Other synonyms of pediatrist include baby doctor, paediatrician.

pediatrist (noun)	pediatrician (noun)
a specialist in the care of babies	a specialist in the care of babies