Girlfriend, learning the basics
For example, if you went to the park and she kept looking and touching the flowers, you can call her bumble bee. The most commonly used one and another good source of inspiration is food. You can choose from fruits, like strawberry or you can choose from sweets, such as cupcake. Your girlfriend will love that you see her as sweet and cute as those sweets and fruits. But make sure not to call her anything that is connected to heavy meal, like pork chop.