Here are a few:
deipnosophist: a person skilled in the art of dining and dinner-table conversation
floccinaucinihilipilification: the action or habit of estimating something as worthless (a word generally only quoted as a curiosity)
kinnikinnick: a substance consisting of dried sumac leaves and willow or dogwood bark, smoked by North American Indians
gobbledygook: created from the meaningless sound that turkeys make, gobbledygook(noun) was originally an American English word. It was created in the 1940’s to mean words that are nonsense or have no meaning. It also describes when people use too many technical words and so other people can’t understand what they're saying
lackadaisical: meaning lazy, it’s been in use since the 1700’s, although where it came from isn’t clear.