demographist vs population scientist

demographist and population scientist both are nouns.

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

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

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

Other synonyms of demographist include demographer.

demographist (noun)	population scientist (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