sourdough vs colonist

sourdough and colonist both are nouns.

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

As nouns, colonist is a hypernym of sourdough; that is, colonist is a word with a broader meaning than sourdough:

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

Other hypernyms of sourdough include prospector, settler.

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