Is usury a form of extortion?

Is usury a form of extortion? St. Paul lists extortion among the mortal sins in 1 Cor. 6:10 : "…nor extortioners (άρπαγες, *rapaces*, "the rapacious"), shall possess the kingdom of God." Ex. 22:25 relates extortion and usury: "If thou lend money to any of my people that is poor, that dwelleth with thee, thou shalt not be hard upon them as an extortioner [*exactor*], nor oppress them with usuries."