Intrusion rhymes with:
extrusion, extrusion, allusion, collusion, conclusion, confusion, contusion, delusion, diffusion, disillusion, exclusion, extrusion, fusion, illusion, inclusion, infusion, occlusion, preclusion, profusion, rediffusion, reperfusion, seclusion, transfusion
Intrusion sounds like:
intercession, intercom, interregnum