The problem with teaching your kid new words is that they may very well end up using them against you! And usually to their advantage.
Case in point- my child says 'bye' at the drop of a pin to everyone. I mean everyone. He also verry conveniently says bye to me everytime he wants me to stop talking or leave him in peace to wreck his mischief :)
Another example- The word moon. Simple, nice round word with long vowels. I first showed him the Supermoon and he became moonstruck from the word go. Actually moon :p anyhow now he sees the moon everywhere and makes me see it and acknowledge it too! Am sure it's his Telugu genes kicking in...the telugu grooms show their new brides 'din mein taarey' so our man took it a notch up- din mein satellite :D
The list runs long and is convoluted. But his speech aint! Tis simple and limited. And it's shaping my speech up the same way.
So when you meet me next, if you find me a bit moony...don't call the loony bin on me...just remember this note and say 'bye'...I'll probably get the hint :)