booklover vs book lover

booklover and book lover both are nouns.

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

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

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

Other synonyms of booklover include bibliophile.

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