The term 'Oliver Twist, for example' can be summarized by the crossword solution 'WAIF', which is a four-letter word. A WAIF is a homeless person, especially a child, who has been abandoned or is without family or friends. The term is often used in reference to the title character of Charles Dickens' novel Oliver Twist, which tells the story of an orphaned boy who is forced to live on the streets and fend for himself.