"Very interesting word", said Grandpa. "Could be the only word with this property"
"What property?", I asked
"At least 9 letters long and first four letters are same as the last four letters!
It is kind of a medical word and starts with a name.
And son, it is not a hyphenated word, nor it is a intentionally made double word like abracadabra or muckamuck. No cheat words like that!"
"Where did you find it?" I asked
"On the Net. Someone generated a list for me. But this one was the only non made up word. It is in the MW dictionary"