There are actually two kinds of pass receivers, the wide receivers, and a tight end. As with running backs, there can be many combinations, but the most common combo is the two wide receiver one tight end set. He's usually a lot bigger than his wide receiver counterparts. Size is important at this position since on most plays he's blocking someone. Two names that come to mind are Shannon Sharpe of the Denver Broncos and Ben Coates of the New England Patriots, both of whom go in the 225-240 range.
Speed is a major concern, size can vary from the pint sized to the full sized.
Like the running back and the quarterback, the receiver is a high profile position. This means he threw the ball to a member of the other team, and that team now takes possession of the ball. Similarly, when a ball carrier drops the ball before his knee touches the ground, it is a fumble. The defensive player can recover the fumble and, like the interception, can advance the ball upfield until tackled, or until he scores a touchdown for his side. Make more than one or two per game and you probably lose, unless the other team commits more.