discoverer vs Sir Hiram Stevens Maxim

discoverer and Sir Hiram Stevens Maxim both are nouns.

Word	Noun	Adjective	Verb	Adverb
discoverer	Yes	No	No	No
Sir Hiram Stevens Maxim	Yes	No	No	No

discoverer (noun)	Sir Hiram Stevens Maxim (noun)
someone who is the first to observe something	English inventor (born in the United States) who invented the Maxim gun that was used in World War I (1840-1916)
someone who is the first to think of or make something