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Synonyms for U (same or very similar meaning)

WordNet sense 1 (a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine):

WordNet sense 2 (a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons):

WordNet sense 3 (the 21st letter of the Roman alphabet):
letter u

WordNet sense 4 (occupying the highest socioeconomic position in a society):

From the ODE community, based on WordNetadd/edit