Verb (used with object), : to exterminate an enemy; to exterminate insects.    From Dictionary.com. 

It was in my youth, of course, that the world became exterminable, thanks to nuclear weapons.    From Wordnik.com.  [Tom Engelhardt: Living in the 51st State (of Denial)] Reference

Is there a difference between urban-squirrels and rats that would make one exterminable and the other protected?.    From Wordnik.com.  [The dreaded nastiness of urban-squirrel season is upon us. - 22 Words] Reference

The exterminable spirit it contains, etc. (7, line 23.).    From Wordnik.com.  [The Complete Works of Percy Bysshe Shelley — Volume 3] Reference

The exterminable spirit it contains.    From Wordnik.com.  [The Complete Works of Percy Bysshe Shelley — Volume 3] Reference