Suppression rhymes with:
oppression, compression, decompression, depression, expression, impression, misimpression, oppression, repression, aggression, compression, decompression, depression, digression, discretion, expression, freshen, impression, indiscretion, misimpression, nonaggression, oppression, progression, regression, repression, transgression
Suppression sounds like:
severson, shepperson, siverson, sovereign, sparacino, sparkman, sporkin, spurgeon, spurgin, subversion, syverson