white book vs white paper

white book and white paper both are nouns.

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

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

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