How to say "navy" in Japanese

• 海軍かいぐんCommon
  nounThe navy as a branch of a country's armed forces, with its warships and sailors. Use it when discussing the military, naval battles, or someone who served in the navy.
  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.
• ネイビーCommon
  nounThe color, not the military force: this loanword means navy blue, the very dark blue used when describing clothes, ties, and similar items.

Use 海軍 for the navy as a military force at sea, and 「ネイビー」 for navy as a color; the senses never overlap, so decide which sense you mean and the choice follows.

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

• 海軍かいぐんnavy
• ネイビーnavy
• 水軍すいぐんnavy (esp. the Japanese navy prior to the 1850s)
• ネイヴィーUnited States Navy