Alexander R. Todd vs chemist

Alexander R. Todd and chemist both are nouns.

Word	Noun	Adjective	Verb	Adverb
Alexander R. Todd	Yes	No	No	No
chemist	Yes	No	No	No

Alexander R. Todd (noun)	chemist (noun)
Scottish chemist noted for his research into the structure of nucleic acids (born in 1907)	a scientist who specializes in chemistry
	a health professional trained in the art of preparing and dispensing drugs