Can She Learn 160 Words?

I read that Stanly Coren, dog expert, says that the average dog learns about 160 words.  I don't know how to tell how many words Coco "knows", but I decided to list how many commands she's mastered:

sit
go get it
down
off
free
come
stay
where's your ball?
go get daddy
on your bed
on your mat
shake
roll over
crawl
up
let's go!

I think that is about it, but we are trying to teach her to turn the light off.  That is proving to be more difficult than "shake."