What rhymes with castro

amphiaster, astor, athabaska, baluster, barrister, basra, bastardy, baster, bastia, blaster, brewmaster, bushmaster, casablanca, castro, cathar, concertmaster, cotoneaster, criticaster, cytaster, dabster, decastere, diaster, disastrous, faster, forecaster, gastrovascular, ghastlier, harvester, larcenist, lassoer, napster, palstave, pasta, pasture, plasterboard, preposterous, raster, sandblaster, shasta, shastra, sportscaster, stationmaster, tapster, telecaster, vassar, vaster, verticillaster, yardmaster