"navy" in the noun sense
1. navy, naval forces
an organization of military vessels belonging to a country and available for sea warfare
2. dark blue, navy, navy blue
a dark shade of blue
3. United States Navy, US Navy, USN, Navy
the navy of the United States of America the agency that maintains and trains and equips combat-ready naval forces
Source: WordNet® (An amazing lexical database of English)
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