| Words |
|---|
| Unbaptized |
| Unclean |
| Uniformity |
| Unigenitus |
| Unimpaired |
| Union |
| Unitatis |
| Unitive |
| Unity |
| Universal |
| Universalism, |
| Universe |
| University |
| Unjust |
| Unleavened |
| Unmoved |
| Unpardonable |
| Upper |
| Urbanists |
| Urbi |
| Urim |
| Ursulines |
| Usq |
| Usury |
| Utrecht, |
| Ux |
| Ubiquitarianism |
| Ubiquity |
| Ult |
| Ultimate |
| Ultramontane |
| Unam |
| Unconscious |
| Uncreated |
| Unction |
| Underground |
| Understanding |
| Uniat |
| Unicity |
| Unit |
| Universal |
| Universalism, |
| Unmoral |
| Unnatural |
| Utopia |
| Utraquism |