discoverer vs Samuel Pierpont Langley

discoverer and Samuel Pierpont Langley both are nouns.

Word	Noun	Adjective	Verb	Adverb
discoverer	Yes	No	No	No
Samuel Pierpont Langley	Yes	No	No	No

discoverer (noun)	Samuel Pierpont Langley (noun)
someone who is the first to observe something	United States astronomer and aviation pioneer who invented the bolometer and contributed to the design of early aircraft (1834-1906)
someone who is the first to think of or make something