Book vs religious text

Book and religious text both are nouns.

Word	Noun	Adjective	Verb	Adverb
Book	Yes	No	No	No
religious text	Yes	No	No	No

As nouns, religious text is a hypernym of Book; that is, religious text is a word with a broader meaning than Book:

Other hypernyms of Book include religious writing, sacred text, sacred writing.

Book (noun)	religious text (noun)
the sacred writings of the Christian religions	writing that is venerated for the worship of a deity
the sacred writings of Islam revealed by God to the prophet Muhammad during his life at Mecca and Medina