Use the word term or expression?

I am making a jeopardy review game, and I can't figure out whether to use the word term or expression. The phrase that I am planning on is "in the following expression it is negative 2" with the following expression being -2n to the power of 3. (That will be written properly in the presentation). I am correct that in this case it is like a square is a rectangle but not all rectangles are squares, in that a term may be an expression but an expression is a group of terms (one or more)? I just want to make sure that I'm using the correct phrasing for my students.