Plain salt is a salt that contains only metal ions (or ammonium ions) and acid radical. It is created when all ions of hydrogen in an acid are replaced with ions of metal (or ammonium ions).
Generalic, Eni. "Plain salt." Croatian-English Chemistry Dictionary & Glossary. 29 June 2022. KTF-Split. {Date of access}. <https://glossary.periodni.com>.
Glossary
Periodic Table