puzzled vs nonplussed

puzzled and nonplussed both are adjectives.

Word	Noun	Adjective	Verb	Adverb
puzzled	No	Yes	No	No
nonplussed	No	Yes	No	No

As adjectives, puzzled and nonplussed are synonyms defined as:

Other synonyms of puzzled include at a loss, nonplused.

puzzled (adjective)	nonplussed (adjective)
filled with bewilderment	filled with bewilderment