Here's what rhymes with postcollective.
collective selective affective connective elective effective objective protective corrective directive convective projective deflective perspective respective subjective defective prospective detective reflective infective invective ineffective irrespective retrospective introspective noneffective intersubjective nonobjective Words that almost rhyme with postcollective
restive attentive festive aggressive offensive oppressive receptive congestive perceptive reflexive pensive retentive progressive incentive suggestive depressive digestive preventive compressive deceptive inventive obsessive possessive recessive redemptive regressive inattentive preemptive suppressive digressive overattentive extensive excessive expensive impressive intensive successive defensive expressive hypertensive repressive inoffensive imperceptive overaggressive unperceptive unoffensive apprehensive contraceptive coextensive hypotensive proprioceptive transgressive disincentive retrogressive unimpressive comprehensive inexpensive counteroffensive inexpressive antihypertensive nonsuccessive immunosuppressive