Sudden, heavy impact

SHOCK
WordClue
TUGsudden powerful pull
BANGsudden percussive noise
GASPshort, sudden intake of breath
GRABsudden snatch at something
HUFFheavy breath
SLAMsudden impact or blow
TANKheavy armored
HITCHsudden pull
LURCHsudden or unsteady movement
PANICsudden sensation of fear
PLUMPThe sound of a sudden heavy fall
SPASMsudden contraction
WALLOPheavy blow, punch
TRAMPLEheavy stepping
WALKOUTsudden stoppage of work
DOWNPOURheavy rain
WHITEOUTheavy snowstorm
BATTERINGheavy beating
CARDBOARDheavy-duty paper of various strengths
DEUTERIUMheavy hydrogen
SPASMsudden contraction
SLAMsudden impact or blow