preconception vs preconceived notion

preconception and preconceived notion both are nouns.

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

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

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

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

preconception (noun)	preconceived notion (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