common sense vs mother wit

common sense and mother wit both are nouns.

Word	Noun	Adjective	Verb	Adverb
common sense	Yes	No	No	No
mother wit	Yes	No	No	No

As nouns, common sense and mother wit are synonyms defined as:

Other synonyms of common sense include good sense, gumption, horse sense, sense.

common sense (noun)	mother wit (noun)
sound practical judgment	sound practical judgment