Bible vs Good Book

Bible and Good Book both are nouns.

Word	Noun	Adjective	Verb	Adverb
Bible	Yes	No	No	No
Good Book	Yes	No	No	No

As nouns, Bible and Good Book are synonyms defined as:

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

Bible (noun)	Good Book (noun)
the sacred writings of the Christian religions	the sacred writings of the Christian religions