One of the tiels we had when growing up knew about at least 100 words. He would say:

Hello
Hi
Pretty bird
Hello pretty bird
Goodmorning (when you took off his cage sheet)
Go to sleep (what my mom told him everytime he started yacking)
Here kitty kitty kitty
Awwwwccchuuu! When he sneezed he would lower his head too, like us humans do. It was so funny!
He would meow like the cats
bark like a dog (my chihuahua)
whistle and Any Griffith Show tune
go "dun dun dun dun dun dun dun, CHARGE!"
wolf whistle
he also knew curse words
He would always tell my mother she was "sexy" lol
what are you doing?
where have you been?
Polly want a cracker
feed me
who's there

and so many other things. That bird could say anything and mimic anything, but like I said once before, my friends dog ate him.