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

辿たどしい[tadotadoshii] with difficulty
辿りつく[tadoritsuku] to struggle on to

辿る[tadoru] to follow (road)
元を辿る[motowotadoru] to trace back to (the origins of something)