The correct spelling of the phrase "lot of book" is actually "a lot of books." The pronunciation of the word "lot" in this context is /lɑt/ with a long "o" sound. The word "of" is pronounced as /əv/. The plural form of "book" is pronounced as /bʊks/. Therefore, it is essential to make sure that the plural agreement is made in the phrase to convey the intended meaning accurately. "A lot of books" means a significant number of books, while "a lot of book" may not convey the same meaning.