Sister’s cat “Shadow” has quite a few words.
Usually “I’m Shadow!” and “Mommy”, but lately he’s been using “Oh No” and “Oh Wow” more often.
He hasn’t had occaision to use “Hello” recently, he hasn’t had anyone to freak out with it.
He did repeatedly say “No” out the window at the weather.
I shall have to inquire of sis as to what that was about.
They can communicate the obvious things, like “Our bowl is empty!” or “You’re going to bed now!” with simple telepathy.