New robot for STEM project

Hello, I have very little knowledge in science so this will be an interesting and very ambitious thing for me to try out.  I would like my robot to be voice acitivated.  How can I make it so that I give it a command and it follows?

Your request is very far reaching.

There are chips on the market that can “comprehend” 5 to 10 very different words, and, provide a specific output depending on which word was “heard”. Beyond that you could have a laptop on the mobile platform running windows and a copy of dragon naturally speaking. It would be up to you to figure out how to interact with the outside world from the pc. I am sure there are few options in between the two I have mentioned. It really depends on what you are trying to do.