Samuel Pierpoint Langley vs discoverer

Samuel Pierpoint Langley and discoverer both are nouns.

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

Samuel Pierpoint Langley (noun)	discoverer (noun)
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 observe something
	someone who is the first to think of or make something