15-letter words containing r, o, j, a
- traveller's joy — a ranunculaceous Old World climbing plant, Clematis vitalba, having white flowers and heads of feathery plumed fruits
- trojan asteroid — one of a number of asteroids that have the same mean motion and orbit as Jupiter, preceding or following the planet by a longitude of 60°
- universal joint — piece that couples two rotating shafts
- well trajectory — The well trajectory is the direction in which the well is drilled.