wise guy vs wisenheimer

wise guy and wisenheimer both are nouns.

Word	Noun	Adjective	Verb	Adverb
wise guy	Yes	No	No	No
wisenheimer	Yes	No	No	No

As nouns, wise guy and wisenheimer are synonyms defined as:

wise guy and wisenheimer: an upstart who makes conceited, sardonic, insolent comments

Other synonyms of wise guy include smart aleck, weisenheimer, wiseacre.

wise guy (noun)	wisenheimer (noun)
an upstart who makes conceited, sardonic, insolent comments	an upstart who makes conceited, sardonic, insolent comments