安危[anki] fate
危うい[ayaui] dangerous
危うく[ayauku] barely
危ない[abunai] dangerous
危ながる[abunagaru] to be afraid of

危なっかしい[abunakkashii] dangerous
危ぶむ[ayabumu] to fear
危める[ayameru] to wound
危絵[abunae] suggestive or indecent picture
危害[kigai] injury

疑惧[giku] apprehension
惧れる[osoreru] to fear
危惧[kigu] apprehensions

絶滅危惧種[zetsumetsukigushu] endangered species
準絶滅危惧[junzetsumetsukigu] near-threatened (species)
絶滅危惧[zetsumetsukigu] threatened (species)

隠滅[inmetsu] destruction
潰滅[kaimetsu] destruction
撃滅[gekimetsu] destruction
幻滅[genmetsu] disillusionment
攻め滅ぼす[semehorobosu] to attack and overthrow

支離滅裂[shirimetsuretsu] incoherent
自滅[jimetsu] ruining oneself
消滅[shoumetsu] lapse
心頭滅却[shintoumekkyaku] clearing one's mind of all mundane thoughts
生者必滅[shoujahitsumetsu] All living things must die

亜種[ashu] subspecies
異機種[ikishu] heterogenous equipment
異種[ishu] different kind (species, variety)
育種[ikushu] (plant) breeding
育種家[ikushuka] (plant) breeder

育種所[ikushujo] (plant) nursery
一種[isshu] species
一粒種[hitotsubudane] an only child
種違い[tanechigai] half-brother
艶種[tsuyadane] love affair

隔絶[kakuzetsu] isolation
気絶[kizetsu] faint
拒絶[kyozetsu] refusal
拒絶反応[kyozetsuhannou] (organ) rejection
空前絶後[kuuzenzetsugo] (so marvelous or horrible that it may be) the first and probably the last

懸絶[kenzetsu] great difference
根絶[konzetsu] eradication
謝絶[shazetsu] refusal
絶えず[taezu] constantly
絶える[taeru] to die out