Book of Judges vs Old Testament

Book of Judges and Old Testament both are nouns.

Word	Noun	Adjective	Verb	Adverb
Book of Judges	Yes	No	No	No
Old Testament	Yes	No	No	No

Book of Judges (noun)	Old Testament (noun)
a book of the Old Testament that tells the history of Israel under the leaders known as judges	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