Thornburg's rhymes with:
thornburgh's, thornburghs, thornburgs, thornburgh's, thornburghs, thornburgs, thornburgh's, thornburghs, thornburgs, freedenberg's, greenberg's, hoffenberg's, katzenberg's, rittenberg's, rosenberg's, rosenbergs, steinberg's, thornburgh's, thornburghs, thornburgs, wallenberg's
Thornburg's sounds like:
thornberg, thornberry's, thornberrys, thornburg, thornburgh, thornburgh's, thornburghs, thornburgs, thornbury's, thornburys, tranberg, turnovers