Giotto di Bondone vs old master

Giotto di Bondone and old master both are nouns.

Word	Noun	Adjective	Verb	Adverb
Giotto di Bondone	Yes	No	No	No
old master	Yes	No	No	No

Giotto di Bondone (noun)	old master (noun)
Florentine painter who gave up the stiff Byzantine style and developed a more naturalistic style; considered the greatest Italian painter prior to the Renaissance (1267-1337)	a great European painter prior to 19th century