We have put together a list of words that are similar to OVERKILL.

6 Alternative Words Similar to overkill

1 Capability Noun      Synonym Words Like Capability
2 Capableness Noun      Synonym Words Like Capableness
3 Effort Noun      Synonym Words Like Effort
4 Exertion Noun      Synonym Words Like Exertion
5 Sweat Noun      Synonym Words Like Sweat
6 Travail Noun      Synonym Words Like Travail

5 definitions of overkill

1 A destructive capacity that exceeds that needed to destroy an enemy; especially with nuclear weapons.
2 An unnecessary excess of whatever is needed to achieve a goal.
3 To destroy something with more (nuclear) force than is required.
4 the capability to obliterate a target with more weapons (especially nuclear weapons) than are required
5 any effort that seems to go farther than would be necessary to achieve its goal
We get our data from many different dictionaries across the web:
Wordnik, Wiktionary, Century, American Heritage, Gcide