| A | B |
| subconscious | (adj) not fully aware, below thinking level. |
| subcutaneous | (adj) under the skin |
| subdue | (v) to bring under control |
| subfreezing | (adj) below freezing |
| subirrigate | (v) to water something from under the ground |
| subject | (v) to put under someone's control |
| submarine | (n) a watercraft that stays under water |
| submerge | (v) to put under water |
| subordinate | (n) a person who is under someone else in rank |
| subway | (n) an electric underground railway |
| superb | (adj) outstanding; beyond the expected. |
| superimpose | (n) to lay or place something over something else |
| superintendent | (n) a person with the highest power in an organization; above everyone |
| superior | (adj) above average in quality; excellent |
| supervisor | (n) a person who is over other people or in charge of someone else. |
| surcharge | (n) extra money over and above what is needed |
| surplus | (n) a quality or amount over and above what is actually needed; extra |
| surprise | (n) an extremely unexpected event, beyond what is predicted. |
| surreal | (adj) unreal; bizarre |
| surtax | (n) an extra tax |