population vs colonization

population and colonization both are nouns.

Word	Noun	Adjective	Verb	Adverb
population	Yes	No	No	No
colonization	Yes	No	No	No

As nouns, colonization is a hypernym of population; that is, colonization is a word with a broader meaning than population:

Other hypernyms of population include colonisation, settlement.

population (noun)	colonization (noun)
the act of populating (causing to live in a place)	the act of colonizing; the establishment of colonies
(statistics) the entire aggregation of items from which samples can be drawn
the people who inhabit a territory or state
a group of organisms of the same species inhabiting a given area
the number of inhabitants (either the total number or the number of a particular race or class) in a given place (country or city etc.)