Oppression rhymes with:
suppression, compression, decompression, depression, expression, impression, misimpression, repression, suppression, aggression, compression, decompression, depression, digression, discretion, expression, freshen, impression, indiscretion, misimpression, nonaggression, progression, regression, repression, suppression, transgression
Oppression sounds like:
o'bregon, oberhausen, obregon, overcame, overcome, overseen, overson