old master vs Holbein the Younger

old master and Holbein the Younger both are nouns.

Word	Noun	Adjective	Verb	Adverb
old master	Yes	No	No	No
Holbein the Younger	Yes	No	No	No

old master (noun)	Holbein the Younger (noun)
a great European painter prior to 19th century	German painter and engraver noted for his portraits; he was commissioned by Henry VIII to provide portraits of the English king's prospective brides (1497-1543)