Writings vs Book of Ruth

Writings and Book of Ruth both are nouns.

Word	Noun	Adjective	Verb	Adverb
Writings	Yes	No	No	No
Book of Ruth	Yes	No	No	No

Writings (noun)	Book of Ruth (noun)
the third of three divisions of the Hebrew Scriptures	a book of the Old Testament that tells the story of Ruth who was not an Israelite but who married an Israelite and who stayed with her mother-in-law Naomi after her husband died