pediatrician vs pediatrist

pediatrician and pediatrist both are nouns.

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

As nouns, pediatrician and pediatrist are synonyms defined as:

Other synonyms of pediatrician include baby doctor, paediatrician.

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