Suppressing rhymes with:
oppressing, compressing, depressing, expressing, impressing, oppressing, pressing, repressing, addressing, compressing, depressing, digressing, distressing, dressing, expressing, impressing, oppressing, pressing, progressing, redressing, repressing, stressing, transgressing
Suppressing sounds like:
sovereigns, sparking, sporkin's, spraggins, sprucing, supersonic