muggins vs saphead

muggins and saphead both are nouns.

Word	Noun	Adjective	Verb	Adverb
muggins	Yes	No	No	No
saphead	Yes	No	No	No

As nouns, muggins and saphead are synonyms defined as:

Other synonyms of muggins include fool, sap, tomfool.

muggins (noun)	saphead (noun)
a person who lacks good judgment	a person who lacks good judgment