smart aleck vs wise guy

smart aleck and wise guy both are nouns.

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

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

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

Other synonyms of smart aleck include weisenheimer, wiseacre, wisenheimer.

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