| Antagonym | contranym |
| Antonym | antonym |
| Antigone | Antigone |
| Antagonist | antagonist |
| Astronym | astronym |
| anonym | anonymous |
| Antazidum | antacid |
| Antazolin | antazoline |
| Autoantonym | contranym |
| Antagonismus | antagonism |
| Anthroponym | anthroponym |
| Antienzym | antienzyme |
| Antifon | antiphon |
| Antigen | antigen |
| Antimon | antimony |
| Antimonit | antimonite stibnite |
| Anton | Anthony Antony |
| Antonia | Antonette Latonya |
| Antonymie | antonymy |
| Pentagon | pentagon Pentagon |