demographer vs demographist

demographer and demographist both are nouns.

Word	Noun	Adjective	Verb	Adverb
demographer	Yes	No	No	No
demographist	Yes	No	No	No

As nouns, demographer and demographist are synonyms defined as:

demographer and demographist: a scientist who studies the growth and density of populations and their vital statistics

Other synonyms of demographer include population scientist.

demographer (noun)	demographist (noun)
a scientist who studies the growth and density of populations and their vital statistics	a scientist who studies the growth and density of populations and their vital statistics