Floccinaucinihilipilification, the declaration of an item being useless, is the longest non-medical term in the English language.
125
A group of ferrets is called a business.
6
The word "impossible" dropped in use by 50% over the course of the 20th century
5
Longest officially recognized place name is Taumatawhakatangihangakoauauotamateapokaiwhenuakitanatahu.
112
"Stewardesses" is the longest word that is typed with only the left hand.
384
Switching letters is called spoonerism. For example, saying "jag of Flapan", instead of "flag of Japan".
2
Anuptaphobia is the fear of staying single.
11