Switching letters is called spoonerism. For example, saying "jag of Flapan", instead of "flag of Japan".
2
The word "impossible" dropped in use by 50% over the course of the 20th century
5
A group of ferrets is called a business.
6
Anuptaphobia is the fear of staying single.
11
There are only four words in the English language which end in “dous”:
tremendous, horrendous, stupendous, and hazardous.
tremendous, horrendous, stupendous, and hazardous.
175