Old Testament vs Canticle of Canticles

Old Testament and Canticle of Canticles both are nouns.

Word	Noun	Adjective	Verb	Adverb
Old Testament	Yes	No	No	No
Canticle of Canticles	Yes	No	No	No

Old Testament (noun)	Canticle of Canticles (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 consisting of a collection of love poems traditionally attributed to Solomon but actually written much later