paediatrician vs pediatrist

paediatrician and pediatrist both are nouns.

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

As nouns, paediatrician and pediatrist are synonyms defined as:

Other synonyms of paediatrician include baby doctor, pediatrician.

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