Mutterings rhymes with:
slaughterings, coverings, flavorings, gatherings, maneuverings, manufacturing's, maunderings, offering's, offerings, posturings, renderings, restructurings, slaughterings, sufferings, wanderings
Mutterings sounds like:
mandarins, manternach, matranga, matrons, maturing, maundering, maunderings, meandering, medtronic, mentoring, metering, metternich, midrange, midterms, mitering, modernize, modernizes, moderns, monitoring, mothering, motoring, muttering