Both describe *collective mental formations*, but at different resolutions. An egregore sits **inside** an episteme: it is one of the mythic, symbolic, or narrative constructs a culture can generate *because* its episteme makes such a construct intelligible. Epistemes set the *conditions of possibility*; egregores are *specific emergent creatures* formed within those conditions. Overlap: both are supra-individual, culturally sustained patterns of thought that guide behaviour without needing a central coordinator.