Connotation rhymes with:
annotation, sanitation, accreditation, agitation, amputation, annotation, cohabitation, commutation, computation, dilatation, equitation, facilitation, habitation, hesitation, imitation, imputation, inhabitation, meditation, misinterpretation, palpitation, premeditation, prestidigitation, recitation, rehabilitation, reinterpretation, reputation, sanitation, vegetation, visitation
Connotation sounds like:
camden, canadian, canadienne, candyman, canteen, cantin, cantina, canton, cantone, centanni, centeno, centime, centum, chandon, chinatown, cognition, comden, comedian, comedienne, comedown, commendation, committeeman, commotion, commutation, condemn, condition, condom, condominium, condon, condone, contain, contini, contino, continue, continuum, cosentino, countdown