preconceived opinion vs parti pris

preconceived opinion and parti pris both are nouns.

Word	Noun	Adjective	Verb	Adverb
preconceived opinion	Yes	No	No	No
parti pris	Yes	No	No	No

As nouns, preconceived opinion and parti pris are synonyms defined as:

preconceived opinion and parti pris: an opinion formed beforehand without adequate evidence

Other synonyms of preconceived opinion include preconceived idea, preconceived notion, preconception, prepossession.

preconceived opinion (noun)	parti pris (noun)
an opinion formed beforehand without adequate evidence	an opinion formed beforehand without adequate evidence