While as a student of entomology at University of Illinois, we used a moth identification guide to help us differentiate between the armyworms, cutworms, corn earworm, you get the idea. I am not sure where that guide is online, but I found a similar one for Wisconsin. Now, we may not have all the species they have, but the ones we do are on their guide. It describes their wings, size, and other pertinent information (I’d ignore the flight information as theirs will differ than ours). Ohio State University sells a quick reference card, https://store.extension.iastate.edu/Product/Identifying-moths-in-black-light-and-pheromone-traps-in-the-Midwest, for Midwest moths. I’m thinking of picking up a few of these. If you’re interested, let me know, and I’ll send you one out when they arrive.