discoverer vs beholder

discoverer and beholder both are nouns.

Word	Noun	Adjective	Verb	Adverb
discoverer	Yes	No	No	No
beholder	Yes	No	No	No

As nouns, beholder is a hypernym of discoverer; that is, beholder is a word with a broader meaning than discoverer:

discoverer: someone who is the first to observe something
beholder: a person who becomes aware (of things or events) through the senses

Other hypernyms of discoverer include observer, perceiver, percipient.

discoverer (noun)	beholder (noun)
someone who is the first to observe something	a person who becomes aware (of things or events) through the senses
someone who is the first to think of or make something