Translation of overkill in Spanish

For each entry, there will be the translations of the dictionary, so if one entry is already included there is no extra value in adding this word and I'd say mark it as an error although it is correct.
I will be creating an additional study with a student (his name is Juan), which may appear in local newspapers in the future (in English). However, this may take a couple of weeks too.
If I'll have the time, I will visit sometime, perhaps you can write me an email in English. I will be correcting it and hope not to discover any errors there. In which city do you live?