Robust rhymes with:
bused, bussed, bust, combust, adjust, antitrust, blust, brust, bused, bussed, bust, clevetrust, combust, crust, cussed, discussed, disgust, distrust, dust, encrust, entrust, fussed, fust, gust, guste, hust, incrust, just, knust, lust, mistrust, must, nonplussed, prust, readjust, rust, thrust, trust, unadjust, unjust, ustrust, yust
Robust sounds like:
rapeseed, rapist, ravaged, rebooked, rebuked, refocused, refused, repackaged, repacked, repossessed, revised, revisit, revisited, revoked, rhapsody, riposte, rivest, robichaud, robusta