Old Testament vs Zephaniah

Old Testament and Zephaniah both are nouns.

Word	Noun	Adjective	Verb	Adverb
Old Testament	Yes	No	No	No
Zephaniah	Yes	No	No	No

Old Testament (noun)	Zephaniah (noun)
the collection of books comprising the sacred scripture of the Hebrews and recording their history as the chosen people; the first half of the Christian Bible	an Old Testament book telling the prophecies of Zephaniah which are concerned mainly with the approaching judgment by God upon the sinners of Judah
	a Hebrew minor prophet of the late 7th century BC