渦巻[uzumaki] whirlpool
渦巻く[uzumaku] to whirl
渦状[kajou] spiral
渦中[kachuu] vortex
渦潮[uzushio] whirling tides

渦動[kadou] vortex
渦紋[kamon] whirlpool design
渦流[karyuu] swirling current
渦巻き形[uzumakigata] spiral-shaped

垂迹[suijaku] temporary manifestation by a buddha (in order to save people)
筆迹[hisseki] handwriting
真迹[shinseki] true autograph

事迹[jiseki] evidence
本地垂迹説[honjisuijakusetsu] manifestation theory (holding that Shinto gods are manifestations of buddhas)
迹門[shakumon] first half of the Lotus Sutra, in which the Buddha appears as a spatiotemporally restricted being

遠雷[enrai] distant thunder
機雷[kirai] (sea) mine
機雷原[kiraigen] minefield
魚雷[gyorai] torpedo
魚雷艇[gyoraitei] torpedo boat

仕掛地雷[shikakejirai] booby trap
疾風迅雷[shippuujinrai] with lightning speed
襲雷[shuurai] lightning strike
人工雷[jinkourai] artificial lightning
迅雷[jinrai] thunderclap