| A | B |
| recheck | to look at something again |
| reclosable | able to be sealed or shut again |
| reelect | to vote someone into office again |
| refund | money that is give back; money that is yours again |
| reimburse | to give money back; to pay back |
| remember | to bring back to mind; to have in your thoughts again |
| renew | to make something new again |
| repeat | to say something again |
| respond | to answer back; to talk again |
| revive | to bring back to life; to be alive again |
| symbiosis | a relationship between two different organisms that live together and depend on each other |
| symmetry | having the same shape, size, and position on both sides of a dividing line |
| sympathy | feeling kindness; together with someone who suffers |
| symposium | a conference or meeting together to discuss a topic |
| symptoms | the conditions that together tell a doctor what is wrong |
| synagogue | a place for meeting together for worship and religious instruction in the Jewish faith |
| syndicate | a group of business people working together |
| synonym | a word that has the same meaning as another word |
| synthesis | parts put together to make a whole |
| synthetic | formed together from artificial parts; fake |