subpopulation vs universe

subpopulation and universe both are nouns.

Word	Noun	Adjective	Verb	Adverb
subpopulation	Yes	No	No	No
universe	Yes	No	No	No

As nouns, universe is a hypernym of subpopulation; that is, universe is a word with a broader meaning than subpopulation:

subpopulation: a population that is part of a larger population
universe: (statistics) the entire aggregation of items from which samples can be drawn

Other hypernyms of subpopulation include population.

subpopulation (noun)	universe (noun)
a population that is part of a larger population	everything stated or assumed in a given discussion
	(statistics) the entire aggregation of items from which samples can be drawn
	everything that exists anywhere