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All answers having "Hit hard" as clue:

3 Character Answers:

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BOP

LAM

PEG

POP

RAM

RHO

TAG



4 Character Answers:

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BANG

BASH

BELT

BONK

NAIL

PELT

SLAM

SLAP

SLOG

SLUG

SMIT

SOCK

SWAT

WHAM

WHAP

WHOP



5 Character Answers:

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CLOCK

CLOUT

CLUNK

LACED

LINED

PASTE

POUND

SMACK

SMASH

SMITE

SMOTE

THUMP

WHACK



6 Character Answers:

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BANGON

BASHED

BELTED

BONKED

BOPPED

HAMMER

IMPACT

LARRUP

NAILED

PASTED

RAMMED

SLAMON

SOCKED

THWACK

WALLOP

WELTED



7 Character Answers:

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CLOCKED

COLLIDE

SHELLED

SLUGGED

THUMPED

WHACKED



8 Character Answers:

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BANGINTO

IMPACTED



9 Character Answers:

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CLOBBERED

SMACKEDUP

SMASHINTO