葦笛[ashibue] reed pipe
横笛[yokobue] transverse flute (e.g. a fife)
角笛[tsunobue] horn
汽笛[kiteki] steam whistle
響笛[kyouteki] vibrating pipe

警笛[keiteki] horn
鼓笛[koteki] drum and fife
鼓笛隊[kotekitai] drum and fife band
口笛[kuchibue] whistle
喉笛[nodobue] windpipe

警める[imashimeru] to admonish
機械警備[kikaikeibi] card-key system
機動警察[kidoukeisatsu] mobile police
軍事警察[gunjikeisatsu] military police
警衛[keiei] guard

警戒[keikai] vigilance
警戒心[keikaishin] wariness
警官[keikan] policeman
警句[keiku] aphorism
警護[keigo] bodyguard