nuclear physicist vs Lise Meitner

nuclear physicist and Lise Meitner both are nouns.

Word	Noun	Adjective	Verb	Adverb
nuclear physicist	Yes	No	No	No
Lise Meitner	Yes	No	No	No

nuclear physicist (noun)	Lise Meitner (noun)
a physicist who specializes in nuclear physics	Swedish physicist (born in Austria) who worked in the field of radiochemistry with Otto Hahn and formulated the concept of nuclear fission with Otto Frisch (1878-1968)