impress vs strike dumb

impress is a noun but strike dumb is not a noun.

Word	Noun	Adjective	Verb	Adverb
impress	Yes	No	Yes	No
strike dumb	No	No	Yes	No

As verbs, strike dumb is a hyponym of impress; that is, strike dumb is a word with a more specific, narrower meaning than impress:

impress (noun)	strike dumb (noun)
the act of coercing someone into government service

impress (verb)	strike dumb (verb)
dye (fabric) before it is spun	render speechless, as by surprising or shocking
produce or try to produce a vivid impression of
mark or stamp with or as if with pressure
take (someone) against his will for compulsory service, especially on board a ship
reproduce by printing
impress positively
have an emotional or cognitive impact upon