This tip is pretty basic, but it is something I use surprisingly often.

Typing:

=lorem() or =lorem(x) for any given x, where x is a positive integer*

will give you the classic "Lorem ipsum dolor sit amet..." text.

Typing:

=rand() or =rand(x) for any given x, where x is a positive integer*

gives you some actual english words. But if you are after random words, why not go for pig latin?

* sorry, I was overcome by delusions of mathematics professorship