doorstop

n device to prevent a door from closing or from hitting a wall, etc when it is opened 制门器（防止门关闭的装置）; 门碰头（防止门碰墙的装置）.

doodle, doom, doomed, doomsday, door, door-bell, door-frame, door-handle, door-keeper, door-knob, door-knocker, door-plate, door-way, doorbell, doorknob, doorman, doormat, doornail, doorpost, doorstep, doorway, dope, dopey (also dopy), Doric, dorm, dormancy, dormant, dormer, dormitory, dormitory town, dormouse, dorsal, dory, DOS, dosage, dose, doss, doss-house, dosser, dossier,