Buttressed rhymes with:
interest, noninterest, psychiatrist, aquarist, armbrust, barest, dearest, deforest, direst, embarrassed, florist, forest, forrest, guitarist, interest, jurist, laforest, merest, nearest, noninterest, pendergrast, psychiatrist, purest, rainforest, rarest, reforest, severest, terraced, tourist
Buttressed sounds like:
bathurst, bitterest, bittersweet, boatright, boatwright