| ununbium | (noun) a radioactive transuranic element, with atomic number 112 | Synonyms: atomic number 112, element 112, Uub |
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| ununhexium | (noun) a radioactive transuranic element, with atomic number 116 | Synonyms: atomic number 116, element 116, Uuh |
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| ununpentium | (noun) a radioactive transuranic element, with atomic number 115 | Synonyms: atomic number 115, element 115, Uup |
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| ununquadium | (noun) a radioactive transuranic element, with atomic number 114 | Synonyms: atomic number 114, element 114, Uuq |
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| ununtrium | (noun) a radioactive transuranic element, with atomic number 113 | Synonyms: atomic number 113, element 113, Uut |
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| unusefulness | (noun) the quality of having no practical use | Synonyms: inutility, uselessness |
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| unusualness | (noun) uncommonness by virtue of being unusual | - |
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