Oed didn't know that he'd offed the king.

I guess it all depends on whose version of the story you listen to (Rashomon anyone?); according to Graves it wasn't like that at all (but then what was?).

The -ology site wasn't really an -ology site, just a semiconvenient way of listing a whole bunch all at once. You can do the same thing with *gry to find all the words that M-W recognizes that end in gry. If you're hungry enough and it doesn't make you too angry.