The unglossed headword and the first two "glosses" offer different but closely related ways to say 'welldigger'. Of these only the second, frewru/xos, has literary attestations, all of them displaying the agent-noun function implied for it here (LSJ's citation of Plutarch, Moralia 159C in privileging an adjectival usage ('well-digging') appears to be an error of some sort, as the word does not appear there or anywhere else in Plutarch). The headword occurs only in this form and only here and in ps.-Herodian, Epimerismi 205. The third substantive proffered, freatoru/kths, occurs only here and in other lexica: Synagoge phi196 and Etymologicum Magnum 799.41, where it and frewru/xos serve as gloss and headword, respectively.
The second sentence offers us two verbs derived from the same root. The latter is well-attested but the former occurs only here in any form.