Cat's definitely "talk" to one another. I remember when Suzie's kittens were old enough to walk and play on their own and it was time for a feeding, Suzie would walk up to them, and call out to them with a verbal call I never had heard before and they obediently followed their mother to a quiet area where they could nurse. That call Suzie gave to her kittens, they knew exactly what their mother wanted and followed. On the other had, of all the "meows" Suzie would direct to me, that "mom call" she gave to her kittens I never heard from her. She never used that tone on a human.