nonplus vs dumbfound

nonplus and dumbfound both are verbs.

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

As verbs, nonplus and dumbfound are synonyms defined as:

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

nonplus (verb)	dumbfound (verb)
be a mystery or bewildering to	be a mystery or bewildering to