武器|ぶきbuki[1]atamadaka (head-high)

1. nounweapon; arms; ordnance
   その軍隊ぐんたいは十分じゅうぶんな武器ぶきを持もっていた。↗

   The troops had plenty of arms.
2. nounweapon (something used to gain an advantage); asset

• Synonym兵器へいきNeutralMilitary weapons and ordnance, as in 「核兵器」; leans technical and military, while 「武器」 also figuratively means a powerful means.
• Synonym軍器ぐんきWrittenWritten/formal prose word for military implements; rare even in writing — 「兵器」 is the normal choice.
• SynonymウェポンNeutralLoanword heard mostly in games and film; in everyday speech say 「武器」.
• Related甲兵こうへいWrittenArchaic written word for armor and weapons, or an armed warrior; essentially unused in modern Japanese.
• Related兵仗ひょうじょうWrittenArchaic term for weapons or an armed attendant, found in classical texts and historical material.
• Related得物えものNeutralA weapon held in the hand for combat, or one's weapon of choice and forte; carries a period-drama flavor.

For combat gear or a figurative advantage, 「武器」 is the default. 「兵器」 is military hardware, 「ウェポン」 is common in games and film, and 「得物」 is a hand weapon or one's forte. 「軍器」「甲兵」「兵仗」 are rare written or archaic terms.

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

1. 戦闘せんとうに用もちいる道具どうぐ。
2. 何なんかをするときに有力ゆうりょくな手段しゅだんとなるもの。