English Thesaurus
(noun) 
Definition
a dull heavy sound
She tripped and fell with a sickening thud.
Synonyms
thump
There was a loud thump as the horse crashed into the van.
,
crash
Two people in the flat recalled hearing a loud crash about 1.30am.
,
knock
They heard a knock at the front door.
,
smack
I end up shouting at him or giving him a smack.
, ,
wallop (informal)
With a single wallop, Clarke sent him flying.
,
clunk
,
clonk
(verb) 
Definition
to make or cause to make such a sound
She ran upstairs, her bare feet thudding on the wood.
Synonyms
thump
She thumped her hand on the witness box.
, ,
knock
He was mucking around and he knocked her in the stomach.
, ,
clump
They went clumping up the stairs to bed.
,
wallop (informal)
She walloped me over the head with a cushion.
,
clunk
,
clonk

Additional synonyms

in the sense of clump
Definition
to walk or tread heavily
They went clumping up the stairs to bed.
Synonyms
stomp,
clomp
in the sense of crash
Definition
a sudden loud noise
Two people in the flat recalled hearing a loud crash about 1.30am.
Synonyms
din,
clatter,
clattering,
in the sense of knock
Definition
the sound so caused
They heard a knock at the front door.
Synonyms
knocking,
pounding,
tap,
hammering,
banging,
rap,

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Video: pronunciation of 'thud'

Source

Thesaurus for thud from the Collins English Thesaurus
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