population scientist vs demographist

population scientist and demographist both are nouns.

Word	Noun	Adjective	Verb	Adverb
population scientist	Yes	No	No	No
demographist	Yes	No	No	No

As nouns, population scientist and demographist are synonyms defined as:

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

Other synonyms of population scientist include demographer.

population scientist (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