Rejection rhymes with:
ejection, ejection, injection, interjection, objection, projection, advection, affection, circumspection, collection, complexion, confection, connection, convection, correction, defection, detection, direction, disaffection, disconnection, disinfection, dissection, ejection, election, erection, flexion, imperfection, infection, inflection, injection, inspection, insurrection, interconnection, interjection, intersection, introspection, objection, overprotection, perfection, predilection, preelection, projection, protection, recollection, redirection, reelection, reflection, reinspection, resurrection, section, selection
Rejection sounds like:
ragtime, reaction, recitation, recoton, rectum, requisition, restaino, restitution, reston, resuscitation, ricadonna, richstone, richton, rigatoni, rigdon, risden, risdon, riston, rocketdyne, rosten, roston, roughton, royston, rushton, rustin, ruston