Giant waves (8)
(Other definitions for tsunamis that I've seen before include "Large ocean waves caused by underwater earthquakes" , "Destructive sea waves" , "Huge destructive waves" , "Violent sea waves" , "catastrophes" .)
(Other definitions for tsunamis that I've seen before include "Large ocean waves caused by underwater earthquakes" , "Destructive sea waves" , "Huge destructive waves" , "Violent sea waves" , "catastrophes" .)