Old Testament vs Judah

Old Testament and Judah both are nouns.

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

Old Testament (noun)	Judah (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 ancient kingdom of southern Palestine with Jerusalem as its center
	(Old Testament) the fourth son of Jacob who was forebear of one of the tribes of Israel; one of his descendants was to be the Messiah