A person or thing that decimates; something that causes widespread destruction or death.
From 'decimate' plus the agent noun suffix '-or.' One who or that which decimates. Relatively uncommon in modern usage except in historical or metaphorical contexts.
In ecology, invasive species like the cane toad in Australia are sometimes called 'decimators' because they destroy native species without the balance that evolved predators maintain—language reflects our understanding of ecological relationships.
Complete word intelligence in one call. Free tier — 50 lookups/day.