Synonyms for GU (same or very similar meaning)
WordNet sense 1 (the largest and southernmost island in the Marianas which is administered as a territory of the United States; it was ceded by Spain to the United States in 1898):
GuamWordNet sense 2 (of or related to the genital and urinary organs or their functions):
genitourinaryFrom the ODE community, based on WordNetadd/edit