colonist vs sourdough

colonist and sourdough both are nouns.

Word	Noun	Adjective	Verb	Adverb
colonist	Yes	No	No	No
sourdough	Yes	No	No	No

As nouns, sourdough is a hyponym of colonist; that is, sourdough is a word with a more specific, narrower meaning than colonist:

colonist: a person who settles in a new colony or moves into new country
sourdough: a settler or prospector (especially in western United States or northwest Canada and Alaska)

Other hyponyms of colonist include Pilgrim, Pilgrim Father, pioneer, homesteader, nester, squatter.

colonist (noun)	sourdough (noun)
a person who settles in a new colony or moves into new country	a settler or prospector (especially in western United States or northwest Canada and Alaska)
	a leaven of dough in which fermentation is active; used by pioneers for making bread