Canticle of Canticles vs Canticles

Canticle of Canticles and Canticles both are nouns.

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

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

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

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

Canticle of Canticles (noun)	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