erector

noun

1. A person who, or a device which erects.

   “At this stage of the construction process the only people on the site would normally be groundworkers and the steel erectors, followed by the roof cladders.”

2. Any of several muscles that make parts of the body erect.
3. An attachment to a microscope, telescope, etc. for making the image erect instead of inverted.
4. A vehicle used to support a rocket for transportation and for placing the rocket in an upright position within a gantry scaffold.