im·pact·or 
(ĭm-păktər)
(ĭm-păktər)n.
A body that strikes another, usually larger body in an impact, as a comet striking a planet.
- misalignment
- misalliance
- misallocate
- misallocation
- misally
- misandrist
- misandry
- misanthrope
- misanthropic
- misanthropically
- misanthropist
- misanthropy
- misapplication
- misapply
- misapprehend
- misapprehension
- misappropriate
- misappropriation
- misattribute
- misattribution
- misbecome
- misbegotten
- misbehave
- misbehaver
- misbehavior