Song of Solomon vs Canticle of Canticles

Song of Solomon and Canticle of Canticles both are nouns.

Word	Noun	Adjective	Verb	Adverb
Song of Solomon	Yes	No	No	No
Canticle of Canticles	Yes	No	No	No

As nouns, Song of Solomon and Canticle of Canticles are synonyms defined as:

Song of Solomon and Canticle of Canticles: an Old Testament book consisting of a collection of love poems traditionally attributed to Solomon but actually written much later

Other synonyms of Song of Solomon include Canticles, Song of Songs.

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