A very big city is called a metropolis.
A genius is an extremely clever person.
A tall building is sometimes called a skyscraper.
A square box is sometimes called a package (не знаю как называют квадратную коробку, пусть будет упаковка)
A telephone you can take with you is called a cell phone.
A small machine we sometimes use in maths lessons is called a calculator.
A small thing that produces electricity is called a generator. (Тоже не понятно, что ща маленькая вещь производит электричество)
If you find out some information, you discover it.