smug vs self-satisfied

smug and self-satisfied both are adjectives.

Word	Noun	Adjective	Verb	Adverb
smug	No	Yes	No	No
self-satisfied	No	Yes	No	No

As adjectives, smug and self-satisfied are synonyms defined as:

smug and self-satisfied: marked by excessive complacency or self-satisfaction

smug (adjective)	self-satisfied (adjective)
marked by excessive complacency or self-satisfaction	contented to a fault with oneself or one's actions
	marked by excessive complacency or self-satisfaction