Denshi Jisho — Online Japanese dictionary

こうじ Kouji era (1142.4.28-1144.2.23)
Noun 
こうわ Kouwa era (1099.8.28-1104.2.10)
Noun 
こうあん Kouan era (of the Northern Court) (1361.3.29-1362.9.23)
Noun 
こうえい Kouei era (of the Northern Court) (1342.4.27-1345.10.21)
Noun 
こうおう Kouou era (of the Northern Court) (1389.2.9-1390.3.26)
Noun 
こうげん Kougen era (1256.10.5-1257.3.14)
Noun 
こうねい tranquility; tranquillity; peacefulness
Noun, Obscure term 
こうへい Kouhei era (1058.8.29-1065.8.2)
Noun 
こうほう Kouhou era (964.7.10-968.8.13)
Noun 
こうしょう Koushou era (1455.7.25-1457.9.28)
Noun 
こうりゃく Kouryaku era (of the Northern Court) (1379.3.22-1381.2.24)
Noun 
煕字典 こうきじてん The Chinese kangxi zidian dictionary of 1716, which established the 214 radicals
Noun 
熙字典 こうきじてん The Chinese kangxi zidian dictionary of 1716, which established the 214 radicals
Noun 

You can also

Look up kanji details for 康.

Try a Yahoo Jisho search for 康 .
Try a Goo Jisho search for 康 .
Try a Google search for 康 .