| A | B |
| potential | possible |
| previous | occurring just before another |
| primary | main; most important |
| purchase | to buy; obtain by exchanging money for |
| range | the limits of possible variation |
| region | a large continuous space or area |
| regulations | rules or law to regulate behavior or conduct |
| relevant | important |
| resident | a person who lives in a particular place |
| resources | source of support or reinforcement |