Denshi Jisho — Online Japanese dictionary

傍観 うかん looking on; remaining a spectator
Common word, Noun, Suru verb 
妨害 うがい disturbance; obstruction; hindrance; jamming; interference
Common word, Noun, Suru verb, No-adjective 
暴挙 うきょ violence; reckless action
Common word, Noun 
防御 うぎょ defense; defence; safeguard; protection
Common word, Noun, Suru verb, No-adjective 
防空 うくう air defense; air defence
Common word, Noun 
冒険 うけん risk; venture; adventure
Common word, Noun, Suru verb 
暴行 うこう assault; outrage; act of violence
Common word, Noun, Suru verb 
防災 うさい disaster prevention
Common word, Noun 
妄信 うしん blind acceptance; blind belief; credulity
Common word, Noun, Suru verb 
傍受 うじゅ interception; monitoring; tapping
Common word, Noun, Suru verb 
防水 うすい waterproofing; making watertight
Common word, Noun, Suru verb, No-adjective 
紡績 うせき spinning
Common word, Noun, Suru verb 
防戦 うせん defensive fight (battle)
Common word, Noun, Suru verb 
暴走 うそう running wildly; reckless driving; runaway; rampage
Common word, Noun, Suru verb 
膨大 うだい huge; bulky; enormous; extensive; swelling; expansion
Common word, Na-adjective, Noun, No-adjective 
防弾 うだん bulletproof; bombproof
Common word, Noun, No-adjective 
冒頭 うとう beginning; start; outset
Common word, Adverb, Noun, No-adjective 
暴騰 うとう sudden rise; sharp rise; boom; skyrocketing
Common word, Noun, Suru verb 
暴動 うどう insurrection; rebellion; revolt; riot; uprising
Common word, Noun, No-adjective 
防犯 うはん prevention of crime
Common word, Noun, No-adjective 
暴風 うふう storm; windstorm; gale
Common word, Noun 
亡命 うめい flight from one's country; seeking asylum; defection; emigration (for political reasons); (going into) exile; becoming a (political) refugee
Common word, Noun, Suru verb 
暴落 うらく slump; crash; heavy fall; decline
Common word, Noun, Suru verb 
亡霊 うれい ghost; the dead; departed spirits; apparition
Common word, Noun 
牧草 くそう pasture; grass
Common word, Noun 
牧畜 くちく stock-farming
Common word, Noun 

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