Wat is a good name for a race ouf aliens that are brutal, bulky , killing machines?

im writing a comic for my art class about a group of aliens trying to exterminate the humans. There are two branches to the aliens species, a taller species that are very fragile but make up with it for their intellect, and a shorter (but still ~7 ft tall) stronger bulkier breed with low intelligence and will follow the upper classes demands. Basically an extraterestrial alkida