nuclear physicist vs Hideki Yukawa

nuclear physicist and Hideki Yukawa both are nouns.

Word	Noun	Adjective	Verb	Adverb
nuclear physicist	Yes	No	No	No
Hideki Yukawa	Yes	No	No	No

nuclear physicist (noun)	Hideki Yukawa (noun)
a physicist who specializes in nuclear physics	Japanese mathematical physicist who proposed that nuclear forces are mediated by massive particles called mesons which are analogous to the photon in mediating electromagnetic forces (1907-1981)