wise guy vs smart aleck

wise guy and smart aleck both are nouns.

Word	Noun	Adjective	Verb	Adverb
wise guy	Yes	No	No	No
smart aleck	Yes	No	No	No

As nouns, wise guy and smart aleck are synonyms defined as:

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

Other synonyms of wise guy include weisenheimer, wiseacre, wisenheimer.

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