| Answer | Crossword Clue |
|---|---|
| ISOTOPE | U 235 or U 238, for example. |
| ISOTOPES | U-235 and U-238 |
| ISOTOPES | U-235 and U-238 e.g. |
| metonyms | A word, name, or expression used as a substitute for something else with which it is closely associated. For example, Washington is a metonym for the federal government of the U.S |
