finder vs co-discoverer

finder and co-discoverer both are nouns.

Word	Noun	Adjective	Verb	Adverb
finder	Yes	No	No	No
co-discoverer	Yes	No	No	No

As nouns, co-discoverer is a hyponym of finder; that is, co-discoverer is a word with a more specific, narrower meaning than finder:

finder: someone who is the first to observe something
co-discoverer: someone who is the first of two or more people to discover something

finder (noun)	co-discoverer (noun)
optical device that helps a user to find the target of interest	someone who is the first of two or more people to discover something
someone who is the first to observe something
someone who comes upon something after searching