Holy Scripture vs Good Book

Holy Scripture and Good Book both are nouns.

Word	Noun	Adjective	Verb	Adverb
Holy Scripture	Yes	No	No	No
Good Book	Yes	No	No	No

As nouns, Holy Scripture and Good Book are synonyms defined as:

Holy Scripture and Good Book: the sacred writings of the Christian religions

Other synonyms of Holy Scripture include Bible, Book, Christian Bible, Holy Writ, Scripture, Word, Word of God.

Holy Scripture (noun)	Good Book (noun)
the sacred writings of the Christian religions	the sacred writings of the Christian religions