火薬 (かやく)gunpowder; powder

火薬, its kanji, and other words that share them.Open this graph

Kanji in 火薬

火ひfire; flame
火山かざんvolcano
火災かさいconflagration; fire
噴火ふんかeruption; volcanic eruption
火砕流かさいりゅうpyroclastic flow
放火ほうかarson; setting fire
戦火せんかwartime fire
火事かじfire; conflagration
薬くすりmedicine; pharmaceuticals
農薬のうやくagricultural chemical (i.e. pesticide, herbicide, fungicide, etc.); agrochemical
麻薬まやくnarcotic; drug
医薬品いやくひんmedical and pharmaceutical products; medicinal supplies
薬物やくぶつmedicines; drugs
薬品やくひんmedicine; chemicals
製薬せいやくmedicine manufacture; drug manufacture
弾薬だんやくammunition; ammo

See how 火薬 connects to the rest of Japanese.