reference work vs book of facts

reference work and book of facts both are nouns.

Word	Noun	Adjective	Verb	Adverb
reference work	Yes	No	No	No
book of facts	Yes	No	No	No

As nouns, reference work and book of facts are synonyms defined as:

reference work and book of facts: a book to which you can refer for authoritative facts

Other synonyms of reference work include reference, reference book.

reference work (noun)	book of facts (noun)
a book to which you can refer for authoritative facts	a book to which you can refer for authoritative facts