bibliophile vs book lover

bibliophile and book lover both are nouns.

Word	Noun	Adjective	Verb	Adverb
bibliophile	Yes	No	No	No
book lover	Yes	No	No	No

As nouns, bibliophile and book lover are synonyms defined as:

bibliophile and book lover: someone who loves (and usually collects) books

Other synonyms of bibliophile include booklover.

bibliophile (noun)	book lover (noun)
someone who loves (and usually collects) books	someone who loves (and usually collects) books