哀歌[aika] lament (song)
愛唱歌[aishouka] (one's) favourite song
詠歌[eika] poem (esp. tanka)
艶歌[enka] enka
応援歌[ouenka] rooters' song

歌い合う[utaiau] to sing responsively
歌い上げる[utaiageru] to sing at the top of one's voice
歌詠み[utayomi] tanka composer
歌会[utakai] poetry party or competition

悪童[akudou] bad boy
河童[kappa] kappa (mythical water-dwelling creatures)
河童巻き[kappamaki] cucumber sushi wrapped in nori (seaweed)
学童[gakudou] school child
お河童[okappa] bobbed hair (from resemblance to the mythical Kappa's hair style)

三尺の童子[sanjakunodouji] mere child
児童[jidou] children
児童画[jidouga] pictures drawn by a child
児童劇[jidougeki] juvenile play
児童心理学[jidoushinrigaku] child psychology