Thud
Part of speech: noun
Definition: The sound of a dull impact. Republic F-105 Thunderchief jet ground attack fighter, after the sound it makes when it crashed into the North Vietnamese countryside, due to its high rate of loss.
Part of speech: verb
Definition: To make the sound of a dull impact.
Scrunch
Part of speech: noun
Definition: A crunching noise.
Part of speech: verb
Definition: To crumple and squeeze to make more compact.