pietistic vs holier-than-thou

pietistic and holier-than-thou both are adjectives.

Word	Noun	Adjective	Verb	Adverb
pietistic	No	Yes	No	No
holier-than-thou	No	Yes	No	No

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

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

pietistic (adjective)	holier-than-thou (adjective)
of or relating to Pietism	excessively or hypocritically pious
excessively or hypocritically pious