Reaction rhymes with:
abstraction, action, attraction, classaction, contraction, diffraction, dissatisfaction, distraction, exaction, extraction, faction, fraction, inaction, infraction, interaction, liquefaction, retraction, satisfaction, subtraction, telaction, traction, transaction
Reaction sounds like:
ragtime, recitation, recoton, rectum, rejection, requisition, restaino, restitution, reston, resuscitation, ricadonna, richstone, richton, rigatoni, rigdon, risden, risdon, riston, rocketdyne, rosten, roston, roughton, royston, rushton, rustin, ruston