chemist vs Roberts

chemist and Roberts both are nouns.

Word	Noun	Adjective	Verb	Adverb
chemist	Yes	No	No	No
Roberts	Yes	No	No	No

chemist (noun)	Roberts (noun)
a scientist who specializes in chemistry	a Welsh pirate credited with having taken more than 400 ships (1682-1722)
a health professional trained in the art of preparing and dispensing drugs	United States writer remembered for his historical novels about colonial America (1885-1957)
	United States evangelist (born 1918)
	United States biochemist (born in England) honored for his discovery that some genes contain introns (born in 1943)