So many words.  So many ways to misuse them. So many articles and posts about this.  This article highlights some of the less obvious ones, like perquisite and prerequisite.  Perk comes from perquisite – something extra you get with your job or your apartment, like an extra parking spot.  While a prerequisite is a requirement.  A brother & sister team, Kathryn and Ross Petras wrote this piece.  I'll have to check out their other articles.  Bet their dinner table conversations are fun.