Pocketbook
Part of speech: noun
Definition: A woman's purse. One's personal budget or economic capacity - the amount one can afford. A small book, especially one that can fit in a pocket; a paperback; also a pocket book. A notebook that is small enough to fit in a pocket.
Example sentence: I began as a journalist for my pocketbook and a poet for my soul.
Wallet
Part of speech: noun
Definition: A flat case, often made of leather, for keeping money (especially paper money), credit cards, etc.
Example sentence: It is true that power corrupts. The hope at the polling stations and the actions of the elected representatives, unfortunately, often turn to be opposite. The power of ballot turns into the power of wallet. Some law-makers become law-breakers.