緩衝[kanshou] buffered
緩衝器[kanshouki] shock absorber
緩衝地帯[kanshouchitai] buffer zone
刺衝[shishou] stabbing
衝撃[shougeki] shock

衝撃波[shougekiha] shock wave
衝動[shoudou] impulse
衝動行為[shoudoukoui] shock action
衝動買い[shoudougai] impulsive buying
衝突[shoutotsu] collision

謂われ[iware] reason
謂わば[iwaba] so to speak
所謂[iwayuru] what is called
謂う[iu] to say
謂う所の[iutokorono] what is called

過ちて改めざる是を過ちと謂う[ayamachitearatamezarukorewoayamachitoiu] to err and not change one's ways, this is what it is to err (from Analects of Confucius)
謂れない[iwarenai] unjustified
謂れ因縁[iwareinnen] origin
謂れのない[iwarenonai] unjustified