| 1 | Ancient Greek | βουλή | will, determination, decision; plan, project,... |
| 2 | Ancient Greek | βούλομαι | usually stronger than ἐθέλω , implying choice or... |
| 3 | Proto-Indo-European | gʷel- | throat; to swallow; throat; to dribble; gush... |
| 4 | Proto-Indo-European | kel- | to hit; beat; to pierce, to stab; goblet |