| Prefix for type or gram | 23 |
| Prefix for type | 15 |
| Prefix for tude or meter | 24 |
| Prefix for tude and potent | 26 |
| Prefix for trust or thesis | 26 |
| Prefix for trust | 16 |
| Prefix for trope or stat | 24 |
| Prefix for trooper or medic | 27 |
| Prefix for trooper | 18 |
| Prefix for trillion | 19 |
| Prefix for toxin or dote | 24 |
| Prefix for toxin | 16 |
| Prefix for tourism | 18 |
| Prefix for tope or mer | 22 |
| Prefix for tope | 15 |
| Prefix for tone or plane | 24 |
| Prefix for tone or gram | 23 |
| Prefix for tone | 15 |
| Prefix for ton or phone | 23 |
| Prefix for tiller | 17 |
| Prefix for thesis | 17 |
| Prefix for therm or tope | 24 |
| Prefix for theater | 18 |
| Prefix for the square root of this clue | 39 |
| Prefix for the opposed | 22 |
| Prefix for the EPA | 18 |
| Prefix for the birds? | 21 |
| Prefix for the birds | 20 |
| Prefix for teuch or gon | 23 |
| Prefix for terrorism or tourism | 31 |
| Prefix for terrorism | 20 |
| Prefix for term or wife | 23 |
| Prefix for tend or text | 23 |
| Prefix for tell or warn | 23 |
| Prefix for teeth | 16 |
| Prefix for tasse | 16 |
| Prefix for task | 15 |
| Prefix for table or poise | 25 |
| Prefix for system or type | 25 |
| Prefix for system or sphere | 27 |
| Prefix for system | 17 |
| Prefix for syncrasy | 19 |
| Prefix for syncracy | 19 |
| Prefix for sweet | 16 |
| Prefix for surgery | 18 |
| Prefix for surgeon or transmitter | 33 |
| Prefix for surgeon or logical | 29 |
| Prefix for surgeon | 18 |
| Prefix for suggestion | 21 |
| Prefix for structure | 20 |
| Prefix for struck | 17 |
| Prefix for stop or skid | 23 |
| Prefix for stop | 15 |
| Prefix for stock or horn | 24 |
| Prefix for stitch or style | 26 |
| Prefix for state or mural | 25 |
| Prefix for state | 16 |
| Prefix for stat or sol | 22 |
| Prefix for stat or scope | 24 |
| Prefix for stat | 15 |
| Prefix for sphere or meter | 26 |
| Prefix for sphere or cycle | 26 |
| Prefix for sphere | 17 |
| Prefix for spell | 16 |
| Prefix for space or naut | 24 |
| Prefix for space or gram | 24 |
| Prefix for space or dynamics | 28 |
| Prefix for space | 16 |
| Prefix for sonic | 16 |
| Prefix for some community websites | 34 |
| Prefix for social or trust | 26 |
| Prefix for social or freeze | 27 |
| Prefix for social | 17 |
| Prefix for sleep | 16 |
| Prefix for skid | 15 |
| Prefix for skeleton or spore | 28 |
| Prefix for skeleton | 19 |
| Prefix for sex or verse | 23 |
| Prefix for series | 17 |
| Prefix for septic or social | 27 |
| Prefix for second | 17 |
| Prefix for season or deceased | 29 |
| Prefix for scope or vision | 26 |
| Prefix for scope or patetic | 27 |
| Prefix for scope or meter | 25 |
| Prefix for scope or graph | 25 |
| Prefix for scope | 16 |
| Prefix for scient | 17 |
| Prefix for science or bus | 25 |
| Prefix for science | 18 |
| Prefix for schaum or kat | 24 |
| Prefix for saur | 15 |
| Prefix for said or thought | 26 |
| Prefix for room or date | 23 |
| Prefix for room | 15 |
| Prefix for rocket | 17 |
| Prefix for rhyme or rail | 24 |
| Prefix for responsibly sourced products | 39 |
| Prefix for red | 14 |
| Prefix for rail or plane | 24 |