Multi-kills in Dota2

There appear to be some names for in-game multi kills. "Double Kill" and "Triple Kill" are self explanatory. Can somebody explain what are the numbers behind others, namely: "Ultra Kill" and "Rampage"? Also, I'm not really sure but there appear to be also names for killstreaks. In particular, "Godlike" is supposedly a name for a killstreak (again, I'm not sure how many kills you need to get this) rather than just another multi-kill name. Can somebody provide a comprehensive list here or at least pointer to such one?

Number of kills in a short time span (multi-kills):

• Double kill - 2 kills
• Triple kill - 3 kills
• Ultra kill - 4 kills
• Rampage - 5 kills and above

Number of kills without dying (streaks):

• Killing Spree - 3 kills
• Dominating - 4 kills
• Mega Kill - 5 kills
• Unstoppable - 6 kills
• Wicked Sick - 7 kills
• Monster kill - 8 kills
• Godlike - 9 kills

• Beyond Godlike - 10 kills and above

  • For all the streaks, the announcer says what the banner reads. But for Beyond Godlike, the announcer says, "Holy Shit!", but the banner reads 'Beyond Godlike'.
  • For Monster Kill, the announcer actually says 'Ma-Ma-Ma-Monster Kill'.

Other:

• Ownage - 5 or more kills in a row by one team without them losing any heroes.

The origin of this style of naming kill-streaks comes from Unreal Tournament.