Mustard rhymes with:
mustered, bustard, clustered, custard, flustered, mustered, administered, astred, bastard, blistered, bolstered, bustard, cloistered, clustered, custard, festered, filibustered, flustered, fostered, mastered, mustered, pestered, plastered, registered, sequestered, unregistered, upholstered
Mustard sounds like:
magistrate, mainstreet, mastered, meckstroth, menstruate, mistreat, mistreated, mistretta, mostaert, mustered