| A | B |
| duet | a song or musical performance with two parts |
| bicentennial | 200 year anniversary |
| biped | having 2 feet |
| bilingual | able to speak 2 languages |
| bicuspid | the teeth that have 2 bumps on them |
| dialogue | conversation with 2 people |
| duel | a fight to the death between 2 people |
| duplicity | dishonesty |
| biceps | the two muscles in your upper arm |
| bifocals | glasses with 2 different prescriptions in them |