Registered rhymes with:
unregistered, unregistered, unregistered, unregistered, administered, astred, bastard, blistered, bolstered, bustard, cloistered, clustered, custard, festered, filibustered, flustered, fostered, mastered, mustard, mustered, pestered, plastered, sequestered, unregistered, upholstered
Registered sounds like:
restart, restarted, restored, rightward