Yes, they are opposites, or antonyms.The word abracadabra means "I will create as I speak". Meanwhile the word avada kedavra means "I will destroy as I speak".
The killing curse from Harry Potter is the latter. Abra Cadabra is nothing to do with Harry Potter however avada kedavra may have come from that word because it does sound similar. The Harry Potter curse is Avada Kedavra, which is Aramaic and means "I obliterate when i speak". Abracadabra is also Aramaic but means "I create when I speak".
The incantation associated with magic is "abracadabra". (The comic book villain, and the song by Sugar Ray, are spelled "Abra Kadabra".)
Avada Kedavra is the killing curse in the Harry Potter series which instantly kills someone.
Nothing, but 'Avada Kedavra' is the killing spell.
no. avada kedarva is unblockable
Avada Kedavra, also known as the Killing Curse
"avada kedavra"
Professor Dumledore
avada kedavra Or: Umbridge
Avada Kedavra! >:D
Avada Kedavra