U 1889 – 1923
| 1889 | ugly | 011101100001 |
| 1890 | umbrella | 011101100010 |
| 1891 | unable | 011101100011 |
| 1892 | unaware | 011101100100 |
| 1893 | uncle | 011101100101 |
| 1894 | uncover | 011101100110 |
| 1895 | under | 011101100111 |
| 1896 | undo | 011101101000 |
| 1897 | unfair | 011101101001 |
| 1898 | unfold | 011101101010 |
| 1899 | unhappy | 011101101011 |
| 1900 | uniform | 011101101100 |
| 1901 | unique | 011101101101 |
| 1902 | unit | 011101101110 |
| 1903 | universe | 011101101111 |
| 1904 | unknown | 011101110000 |
| 1905 | unlock | 011101110001 |
| 1906 | until | 011101110010 |
| 1907 | unusual | 011101110011 |
| 1908 | unveil | 011101110100 |
| 1909 | update | 011101110101 |
| 1910 | upgrade | 011101110110 |
| 1911 | uphold | 011101110111 |
| 1912 | upon | 011101111000 |
| 1913 | upper | 011101111001 |
| 1914 | upset | 011101111010 |
| 1915 | urban | 011101111011 |
| 1916 | urge | 011101111100 |
| 1917 | usage | 011101111101 |
| 1918 | use | 011101111110 |
| 1919 | used | 011101111111 |
| 1920 | useful | 011110000000 |
| 1921 | useless | 011110000001 |
| 1922 | usual | 011110000010 |
| 1923 | utility | 011110000011 |
