The correct name for the graduation hat is a mortarboard.
a hat
grade hat I think the proper name is a Mortar Board
cap and gown. the hat is called a mortarboard.
Mortarboard
It's called a "mortar board"
in the library
Sally's brother's name in The Cat in the Hat is Conrad.
list of post graduation courses
You can get a variety of Sterling Silver and Silver Graduation Necklaces.These have a scroll and the mortarboard hat graduates wear.
It was a stovepipe type but I don't think he had a pet name for it although someone will correct me if I'm wrong.
Pinterest, Quill and Zazzle are all great companies to check out to gather graduation ideas. It is possible to customize your own graduation hat and order it online as well.
That is the correct spelling of the noun "hat" (worn on the head).
That is the correct spelling of "top hat" (short version of stovepipe hat).