| Obstructer | n. One who obstructs or hinders. [ 1913 Webster ] |
| obstruction | (n) any structure that makes progress difficult, Syn. impediment, impedimenta, obstructer, obstructor |
| obstructionist | (n) someone who systematically obstructs some action that others want to take, Syn. thwarter, obstructer, obstructor, resister |