Effective rhymes with:
defective, ineffective, affective, anti-infective, defective, ineffective, infective, affective, anti-infective, collective, connective, convective, corrective, defective, detective, directive, elective, ineffective, infective, introspective, invective, irrespective, objective, perspective, projective, prospective, protective, reflective, respective, retrospective, selective, subjective