Letters that make thwack
a, k, c, h, t, w are letters that make 'thwack'
thwacks is a word created by adding a letter to 'thwack'
2 possible definitions for 'thwack'
Under this definition, thwack is a verb and has the following properties:
smack has the same meaning as thwack
'thwack' can be a type of hit.
Under this definition, thwack is a noun and has the following properties:
'thwack' can be a type of blow.