preconception vs preconceived opinion

preconception and preconceived opinion both are nouns.

Word	Noun	Adjective	Verb	Adverb
preconception	Yes	No	No	No
preconceived opinion	Yes	No	No	No

As nouns, preconception and preconceived opinion are synonyms defined as:

preconception and preconceived opinion: an opinion formed beforehand without adequate evidence

Other synonyms of preconception include parti pris, preconceived idea, preconceived notion, prepossession.

preconception (noun)	preconceived opinion (noun)
an opinion formed beforehand without adequate evidence	an opinion formed beforehand without adequate evidence
a partiality that prevents objective consideration of an issue or situation