Answer: saltpeter

AnswerCrossword Clue
SALTPETERGunpowder ingredient
SALTPETERNaturally occurring potassium nitrate
SALTPETERGunpowder component
SALTPETERNiter.
SALTPETERChilean export.
SALTPETERGunpowder compound
saltpeter(US) potassium nitrate, the chief constituent of gunpowder also SALTPETRE