Multitudes rhymes with:
altitudes, aptitudes, attitudes, etudes, interludes, latitudes, longitudes, magnitudes, megafoods, multifoods', platitudes, preludes, seafoods
Multitudes sounds like:
maladich, maladies, maldutis, maltais, maltase, maltese, maltose, malts, maltz, maultasch, melodic, melodies, melodious, melts, meltz, miladic, mildews, miletich, militia's, militias, milledge, millets, milodic, mladic, mladic's, mlotok, molds, moltz, monolithic, monoliths, moulds, multidex, multitask