亢奮[koufun] excitement
興奮剤[koufunzai] stimulant
獅子奮迅[shishifunjin] being irresistible
奮い立つ[furuitatsu] to cheer up
奮う[furuu] to muster (e.g. one's courage)

奮って[furutte] energetically
奮起[funki] stirring
奮迅[funjin] impetuous dash forward
奮戦[funsen] hard fighting
奮闘[funtou] hard struggle

過激[kageki] extreme
過激派[kagekiha] radical party
感激[kangeki] deep emotion
急激[kyuugeki] sudden
矯激[kyougeki] radical

激臭[gekishuu] strong odor
激化[gekika] intensification
激減[gekigen] dropping sharply
激賞[gekishou] enthusiastic praise
激情[gekijou] violent emotion