海軍|かいぐんkaigun[1]atamadaka (head-high)

1. nounnavy; naval force
   彼かれらはパイロットに海軍かいぐんのヘリコプターを操縦そうじゅうさせた。↗

   They made the pilot fly the Navy helicopter.

• SynonymネイビーNeutralLoanword meaning the navy or navy blue; in everyday speech it usually refers to the color, while 「海軍」 is the formal name of the military branch.
• Synonym水軍すいぐんWrittenWritten term for medieval Japanese maritime forces, as in 「村上水軍」; historical in flavor, not used for a modern navy.
• Related水師WrittenWritten term for the naval forces of old China; carries a historical flavor and is rarely used in modern Japanese.
• Antonym陸軍りくぐんNeutralThe army; as a military branch it stands opposite 「海軍」, which handles operations at sea.

Use 「海軍」 for a country's maritime military force, as in 「海軍兵学校」. Historical maritime forces take 「水軍」; the color navy blue is 「ネイビー」; the counterpart branch is 「陸軍」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 海上かいじょう、海中かいちゅうでの作戦さくせん・戦闘せんとうを目的もくてきとした軍隊ぐんたい。