IPA: //ˈmɔːl.tɚ//
KK: /ˈmɔltstər/
A person who produces malt, which is grain that has been soaked, germinated, and dried, typically used in brewing and distilling.
The maltster carefully monitored the grains to ensure they were properly malted.
Maltster → It is formed from "malt" (from Old English *mealt*, meaning a grain that has been soaked, germinated, and dried) and "-ster" (a suffix used in Old English to denote a person who performs a specific action). A maltster is a person who prepares malt, typically for brewing or distilling purposes.
Think of a person who 'prepares grain' ('malt') for brewing — that's what a maltster does.