dumbstruck vs dumbfounded

dumbstruck and dumbfounded both are adjectives.

Word	Noun	Adjective	Verb	Adverb
dumbstruck	No	Yes	No	No
dumbfounded	No	Yes	No	No

As adjectives, dumbstruck and dumbfounded are synonyms defined as:

dumbstruck and dumbfounded: as if struck dumb with astonishment and surprise

Other synonyms of dumbstruck include dumbstricken, dumfounded, flabbergasted, stupefied, thunderstruck.

dumbstruck (adjective)	dumbfounded (adjective)
as if struck dumb with astonishment and surprise	as if struck dumb with astonishment and surprise