discoverer vs observer

discoverer and observer both are nouns.

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

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

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

Other hypernyms of discoverer include beholder, perceiver, percipient.

discoverer (noun)	observer (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	an expert who observes and comments on something