First Person Words

First things first, you HAVE TO transform zombie-like people into objects before they reach to you. If they reach you, you're done!
So before that happen, take a look at the word on top of people. You can use hint pictures to guess the words better. Once you are sure about what the word is, pick missing letters and shoot them!
Well actually never mind, just shoot them and pick random letters. Eventually you'll find the way!