You could start by thinking about which words make sense together! Maybe the words forest, sky, water, and birds make you think of a character walking through nature. Or maybe the words students, time, and science make you think of a character in a classroom taking a science test. Whatever words you start with, try to have a character and a setting to begin your story. Different groups of words can introduce new settings or ideas as you keep writing. If there are any words that surprise you or don't fit with the others, those might add a fun twist!
Here's an example: Sarah watched the students around her taking the science test, and checked the clock at the back of the room. She was running out of time. Sarah had to get good grades, because her mom wanted her to have a career in politics. But she couldn't stop daydreaming about exploring the forest outside. Sarah imagined swimming in the cool water of the lake and looking up at birds in the sky...wasting her last five minutes. Her teacher stood up to collect all the tests. Sarah looked down--her paper was still blank. What would she do? Suddenly, a superhero with amazing strength burst through the door! "Sarah, I need your help," she said.
In my example, the story begins with a character (Sarah), in a setting (the classroom). I used the words that were related to school or taking a test: students, science, time, career, and politics. Then I used the words related to nature to introduce a new idea: Sarah is daydreaming about being outside. She thinks about the forest, sky, water, and birds. Finally, the words "superhero" and "strength" add a twist, bringing a new action to the story.