Wonderment is a feeling of surprise, awe, and joy. People felt wonderment when Neil Armstrong walked on the moon.
Wonder is a feeling of surprised amazement, and so is wonderment. If you feel wonderment, you can't quite believe what you're seeing, but you definitely like it. Parents feel wonderment at the birth of their children, and when their children start walking and talking. Looking at the infinite stars in the sky can create a feeling of wonderment. Being in nature stirs wonderment in many people. Anything that creates wonderment is likely to make you say "Wow!"