Taxation rhymes with:
relaxation, annexation, fixation, indexation, relaxation, subluxation, alsatian, annexation, cessation, compensation, condensation, conversation, dispensation, fixation, indexation, relaxation, sensation, subluxation
Taxation sounds like:
tajikistan, taketomi, techsystem, testimony, teston, thackston, thaxton, tighten, tjaden, touchdown, touchstone, touchton, tsutomu, tustin