The word "is" is not defined

[drewg2009]

https://api.dictionaryapi.dev/api/v2/entries/en/is returns the following response

// 20241201010625
// https://api.dictionaryapi.dev/api/v2/entries/en/is

{
  "title": "No Definitions Found",
  "message": "Sorry pal, we couldn't find definitions for the word you were looking for.",
  "resolution": "You can try the search again at later time or head to the web instead."
}