My housechickens all knew the word "up", "time for bed", "get down" "grapes", their names and several other words. They also knew to stay out of the living room, and could be trusted for brief times if I was out of the house to actually stay out of there. One chicken I had actually learned the word "thirsty" when I would ask her, as she drank a lot, had a crook beak and I think she drank to make up for her hunger, poor dear. The ones I have left will come up and "love on me" by pecking my shirt or pants leg, and they dont peck if I wear shorts, so they know the dif between skin and clothes somehow.
My silly pups dont even have that concept yet and I am weary of sharp teeth, ouch!
I was very surprised at how they learned things if properly socialized. Always had the concept of dumb chickens too.