In the New York Times April Fool’s Day crossword, a clue read, “Word that doesn’t change no matter how many letters you add to it”. Answer? MAILBOX
Trash can, recycling bin, book shelf.
It’s a noun – its a word made of letters and it’s a thing that has letters in it.
Wanted to tell this “group” I got curious and looked it up.
Which two words have more than 1,000 letters? post office