white paper vs white book

white paper and white book both are nouns.

Word	Noun	Adjective	Verb	Adverb
white paper	Yes	No	No	No
white book	Yes	No	No	No

As nouns, white paper and white book are synonyms defined as:

white paper (noun)	white book (noun)
a government report; bound in white	a government report; bound in white