physician vs Sir David Bruce

physician and Sir David Bruce both are nouns.

Word	Noun	Adjective	Verb	Adverb
physician	Yes	No	No	No
Sir David Bruce	Yes	No	No	No

physician (noun)	Sir David Bruce (noun)
a licensed medical practitioner	Australian physician and bacteriologist who described the bacterium that causes undulant fever or brucellosis (1855-1931)