As nouns the difference between verger and churchwarden
is that verger is one who carries a verge, or emblem of office while churchwarden is (british) a lay officer of the church of england who handles the secular affairs of the parish.
is that serger is (sewing) a type of sewing machine designed to produce an overlock stitch and to cut the fabric as it stitches while verger is one who carries a verge, or emblem of office.