What is a word from the Webster dictionary that most AP English wont know the definition of?

My AP English is hosting a word challenge and if he doesnt know the definition of a word, I will get 15 points extra credit. Does anyone know a word from the Webster dictionary that most AP English wont know the definition of?What is a word from the Webster dictionary that most AP English wont know the definition of?
ailurophile - cat lover

otorhinolaryngologist - ear, nose, throat doctor (ENT)
Coulomb ...(Basically only Electrical Engineers and physicists know what it is.)What is a word from the Webster dictionary that most AP English wont know the definition of?
meloid (but what do you mean by "Webster dictionary"?)What is a word from the Webster dictionary that most AP English wont know the definition of?
Snape

everyday minerals