鉄兜[tetsukabuto] steel helmet
兜虫[kabutomushi] rhinoceros beetle (esp. the Japanese rhinoceros beetle, Trypoxylus dichotomus)
内兜[uchikabuto] inside of a helmet
兜蟹[kabutogani] horseshoe crab
鳥兜[torikabuto] aconite (esp. species Aconitum japonicum)

兜頭巾[kabutozukin] helmet-shaped hood
兜率天[tosotsuten] Tusita heaven
勝って兜の緒を締めよ[kattekabutonoowoshimeyo] don't let your guard down even after a victory
角兜[tsunokabuto] spiked helmet

華冑[kachuu] aristocracy
甲冑[kacchuu] armor and helmet (armour)
甲冑師[kacchuushi] armorer

内冑[uchikabuto] inside of a helmet
冑魚[kabutouo] large-headed midnight fish (Poromitra crassiceps)
甲冑魚[kacchuugyo] armored fish

甲胄[kacchuu] armor and helmet (armour)