Classaction rhymes with:
abstraction, action, attraction, contraction, diffraction, dissatisfaction, distraction, exaction, extraction, faction, fraction, inaction, infraction, interaction, liquefaction, reaction, retraction, satisfaction, subtraction, telaction, traction, transaction
Classaction sounds like:
celestin, celestina, celestine, celestino, chalcedony, claxton, clewiston, clogston, closedown, clugston, collection, collocation, colston, coulston, cyclostome