Answer:
1. "Let's call him buttercup." Genna Suggested. 
2. It can be used like this: truck-driver or ice-cream. 
3. “Help! This horse is going too fast,” the actor yelled. “I think I am fall—.” It can be used in this context. 
4. (,) Can be used like this: Oh, ---. 
5. Can be used to exclaim: for eg, Oh my god! or Goodness!