亢奮[koufun] excitement
亢進[koushin] rising

心悸亢進[shinkikoushin] palpitations (of the heart)
亢竜[kouryou] dragon which has already ascended to the heavens

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