Astred rhymes with:
bastard, mastered, plastered, administered, bastard, blistered, bolstered, bustard, cloistered, clustered, custard, festered, filibustered, flustered, fostered, mastered, mustard, mustered, pestered, plastered, registered, sequestered, unregistered, upholstered
Astred sounds like:
asteroid, astrid, astride, austerity