stump vs dumbfound

stump is a noun but dumbfound is not a noun.

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

As verbs, dumbfound is a hypernym of stump; that is, dumbfound is a word with a broader meaning than stump:

Other hypernyms of stump include amaze, baffle, beat, bewilder, flummox, get, gravel, mystify, nonplus, perplex, pose, puzzle, stick, stupefy, vex.

stump (noun)	dumbfound (noun)
(cricket) any of three upright wooden posts that form the wicket
a platform raised above the surrounding level to give prominence to the person on it
the part of a limb or tooth that remains after the rest is removed
the base part of a tree that remains standing after the tree has been felled

stump (verb)	dumbfound (verb)
remove tree stumps from	be a mystery or bewildering to
cause to be perplexed or confounded
travel through a district and make political speeches
walk heavily