dumbfound vs nonplus

dumbfound and nonplus both are verbs.

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

As verbs, dumbfound and nonplus are synonyms defined as:

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

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