pocket book (Noun) — Pocket-sized paperback book.
pocket book (Noun) — Your personal financial means. ex. "that car is too expensive for my pocketbook"
pocket book (Noun) — A pocket-size case for holding papers and paper money.
pocket book (Noun) — A container used for carrying money and small personal items or accessories (especially by women). ex. "she reached into her pocketbook and found a comb"