Granddad or Grand-dad or Grandad?
Which is the correct spelling?
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Both exist, apparently.
The NOAD, says
granddad |ˈgranˌdad| (also grandad) noun informal - one's grandfather.
grandad |ˈgranˌdad|, Noun - variant spelling of granddad .
The OALD says the same thing, and is more specific, saying that "Granddad" is North-American English.
If someone from U.S./UK can confirm, it would add more info.