Pretty sure that's it, but you can get an extermination by killing the entire opposing team with at least an overkill.
yes, but you'd either have to be extremely lucky, or have everyone line up and shoot through all of their heads, and you can get all the kills from that shot.
it goes doule kill, triple kill, overkill. killtacular, killtrocety and after that i don't know that's the highest i have in a kill series.... 2 kills is obviously the double kill, 3=Triple Kill, 4=Overkill, 5=Killtacular, 6=killtrocity, 7=Killamanjaro, 8=killtastrophy, 9=killpocalypse, and 10 kills is the Killionare.