self-righteous vs holier-than-thou

self-righteous and holier-than-thou both are adjectives.

Word	Noun	Adjective	Verb	Adverb
self-righteous	No	Yes	No	No
holier-than-thou	No	Yes	No	No

As adjectives, self-righteous and holier-than-thou are synonyms defined as:

self-righteous and holier-than-thou: excessively or hypocritically pious

Other synonyms of self-righteous include pharisaic, pharisaical, pietistic, pietistical, sanctimonious.

self-righteous (adjective)	holier-than-thou (adjective)
excessively or hypocritically pious	excessively or hypocritically pious