警察犬: police dog

警報: alarm / 刑法: (law) penal code, criminal law / 警砲: warning gun

警察庁: National Police Agency

日時計: sundial / 火時計: a clock that tells time using the burning of sticks of incense or fuses

原子時計: atomic clock (not to be confused with radio clock)

古時計: antique clock

舟形, 船形: boat-shaped / 線形, 線型: (mathematics) being linear; straight alignment / 戦型, 戦形: combat style, playing style / 船型: design of a ship / 扇形: fan-shaped / 線径: wire diameter

経路, 径路: course, pathway / 毛色: hair color

純系: pure bloodline / 巡警: patrolling

計算: calculation / 経産: parity / ケイ酸, 珪酸: silicic acid / 卦算: paperweight