Roberts vs chemist

Roberts and chemist both are nouns.

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

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