prospector vs sourdough

prospector and sourdough both are nouns.

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

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

prospector: someone who explores an area for mineral deposits
sourdough: a settler or prospector (especially in western United States or northwest Canada and Alaska)

prospector (noun)	sourdough (noun)
someone who explores an area for mineral deposits	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