instruction:
Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.
question:
a black powder rocket motor pushes a model rocket using black powder.
answer:
black powder rocket motor


question:
nickel creek was an american acoustic musical group.
answer:
nickel creek


question:
click beetle is the common name for beetles in the family elateridae.
answer:

click beetle