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No, the word doomsday is not an adverb.The word doomsday is a noun and an adjective.
After Doomsday was created in 1962.
Yes. Hulk is stronger than Doomsday. Hulk can punch Doomsday and kill him.
it wouldn't be called a doomsday then, would it?
After Doomsday has 128 pages.