Kyūjitai form of 形声:phonosemantic compounding (a way of creating Han characters by combining a component that indicates the meaning with a component that indicates the pronunciation).

siren, alarm (device for making a sound alarm)

form and shadow

execution ground; place to be killed, especially of convicts

knowledge of a subject

Kyūjitai form of 軽銀: aluminium

secret police

aggressive in relationships

salmons and trouts

The formation of a 系列(けいれつ) (keiretsu), a kind of corporate conglomerate.