What does the word miller mean in Greek?

There isn't a single word in ancient Greek that directly translates to "miller" in the sense of someone who operates a mill. The term would have been descriptive, likely using words referring to the milling process or the grain itself, combined with a word indicating occupation. For example, a phrase might have been used, such as one involving ἄλεσις (álesis, "grinding") or some word related to grain (like πυρός, purós, "wheat").