fox vs dumbfound

fox is a noun but dumbfound is not a noun.

Word	Noun	Adjective	Verb	Adverb
fox	Yes	No	Yes	No
dumbfound	No	No	Yes	No

As verbs, dumbfound is a hyponym of fox; that is, dumbfound is a word with a more specific, narrower meaning than fox:

fox (noun)	dumbfound (noun)
alert carnivorous mammal with pointed muzzle and ears and a bushy tail; most are predators that do not hunt in packs
a shifty deceptive person
the grey or reddish-brown fur of a fox

fox (verb)	dumbfound (verb)
become discolored with, or as if with, mildew spots	be a mystery or bewildering to
be confusing or perplexing to; cause to be unable to think clearly
deceive somebody