| energy |
the ability to have force or power or to do work. There are many kinds of energy such as physical, electrical, nuclear, or chemical. |
| envelope |
a folded paper covering for a letter or other papers you mail. You write the address and put a stamp on an envelope before you mail it. |
| fortune |
a large amount of money or wealth. |
| grief |
great sadness. |
| idea |
any thought or picture formed in the mind. |
| injury |
damage or wrong that causes physical or mental pain or hardship. |
| platform |
a raised, level surface used as a place to work, perform, or speak to an audience. |
| pond |
a small body of still water. |
| recently |
in the near past. |
| scientist |
a person who works in or studies a science. |
| spy |
a person who watches in secret to get information about others. |
| system |
a group of things or parts that work together as a whole. |
| tower |
a tall, narrow building or part of a building that rises high above the ground. |
| twig |
a small branch of a tree or other plant. |
| wire |
a long thread of metal. |