vex vs nonplus

vex and nonplus both are verbs.

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

As verbs, vex and nonplus are synonyms defined as:

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

vex (verb)	nonplus (verb)
be a mystery or bewildering to	be a mystery or bewildering to
subject to prolonged examination, discussion, or deliberation
change the arrangement or position of
cause annoyance in; disturb, especially by minor irritations
disturb the peace of mind of; afflict with mental agitation or distress