I agree with @biermanl - when they graded these during the summer, word limits were pretty much thrown out the window - but I still wouldn't chance it. I too would push the students to cut two words (but not necessarily the last two words
)
Also keep in mind students are not graded on their grammar - as long as they can communicate their point and ideally not make the reader work to understand the response. Maybe okay if students speak like caveman but would only recommend if necessary.