| Article | Vol | Words |
|---|---|---|
| UBES | 20 | 88 |
| UBIQUITARIANS | 20 | 177 |
| UBIQUITY | 20 | 29 |
| UDDER | 20 | 23 |
| UKRAINE | 20 | 128 |
| ULCER | 20 | 9 |
| ULEX | 20 | 23 |
| ULIETEA | 20 | 194 |
| ULIGINOUS | 20 | 12 |
| ULLAGE | 20 | 17 |
| ULM | 20 | 100 |
| ULMUS | 20 | 24 |
| ULSTER | 20 | 366 |
| ULTERIOR | 20 | 39 |
| ULTRAMARINE | 20 | 19 |
| ULTRAMONTANE | 20 | 21 |
| ULVA | 20 | 12 |
| ULUG BEIG | 20 | 86 |
| ULYSSES | 20 | 99 |
| UMBELLA | 20 | 99 |
| UMBELLIFEROUS PLANTS | 20 | 13 |
| UMBER | 20 | 14 |
| UMBILICAL | 20 | 9 |
| UMBRELLA | 20 | 33 |
| UMPIRE | 20 | 11 |
| UNCIA | 20 | 34 |
| UNCTION | 20 | 356 |
| UNDECAGON | 20 | 7 |
| UNDECEMVIR | 20 | 112 |
| UNDERWALDEN | 20 | 61 |
| UNDULATION | 20 | 26 |
| UNGUENT | 20 | 23 |
| UNICORN | 20 | 102 |
| UNIFORM | 20 | 32 |
| UNIFORMITY | 20 | 121 |
| UNION | 20 | 786 |
| UNIT | 20 | 15 |
| UNITARIANS | 20 | 31 |
| UNITED BRETHREN | 20 | 687 |
| UNITED PROVINCES | 20 | 8,863 |
| UNITY | 20 | 72 |
| UNIVERSAL | 20 | 18 |
| UNIVERSE | 20 | 22 |
| UNIVERSITY | 20 | 926 |
| UNIVERSITY-COURT | 20 | 393 |
| UPHOLSTER | 20 | 16 |
| UPLAND | 20 | 82 |
| UPSAL | 20 | 133 |
| UPUPA | 20 | 13 |
| UR | 20 | 91 |
| URALIAN CHAIN | 20 | 27 |
| URANIA | 20 | 33 |
| URANIUM | 20 | 11 |
| URANOSCOPIUS | 20 | 17 |
| URCHIN | 20 | 12 |
| URETHRA | 20 | 262 |
| URINAL | 20 | 28 |
| URINE | 20 | 51 |
| URN | 20 | 98 |
| URSA | 20 | 11 |
| URSULINES | 20 | 29 |
| URSUS | 20 | 15 |
| URTICA | 20 | 27 |
| USANCE | 20 | 48 |
| USE | 20 | 38 |
| USHANT | 20 | 19 |
| USHER | 20 | 55 |
| USK | 20 | 26 |
| USQUEBAUGH | 20 | 178 |
| USTION | 20 | 10 |
| USUFRUIT | 20 | 38 |
| USURER | 20 | 10 |
| USURIOUS CONTRACT | 20 | 20 |
| USURPATION | 20 | 21 |
| USURY | 20 | 191 |
| UTICA | 20 | 100 |
| UTRECHT | 20 | 386 |
| UTRICULARIA | 20 | 23 |
| UZ | 20 | 227 |
| UZBECK TARTARY | 20 | 39 |