Intensification rhymes with:
classification, diversification, falsification, gasification, ossification, pacification, reclassification, russification, acidification, amplification, certification, cladification, clarification, classification, codification, decertification, deification, disqualification, diversification, edification, falsification, fortification, gasification, gratification, identification, justification, magnification, modification, notification, nullification, ossification, pacification, personification, purification, qualification, ramification, ratification, recertification, reclassification, rectification, reunification, russification, sanctification, saponification, unification, verification, vilification