affect vs strike dumb

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

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

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

affect (noun)	strike dumb (noun)
the conscious subjective aspect of feeling or emotion

affect (verb)	strike dumb (verb)
act physically on; have an effect upon	render speechless, as by surprising or shocking
have an effect upon
make believe with the intent to deceive
have an emotional or cognitive impact upon
connect closely and often incriminatingly