Song of Songs vs Writings

Song of Songs and Writings both are nouns.

Word	Noun	Adjective	Verb	Adverb
Song of Songs	Yes	No	No	No
Writings	Yes	No	No	No

Song of Songs (noun)	Writings (noun)
an Old Testament book consisting of a collection of love poems traditionally attributed to Solomon but actually written much later	the third of three divisions of the Hebrew Scriptures