superstitious notion vs superstition

superstitious notion and superstition both are nouns.

Word	Noun	Adjective	Verb	Adverb
superstitious notion	Yes	No	No	No
superstition	Yes	No	No	No

As nouns, superstitious notion and superstition are synonyms defined as:

superstitious notion and superstition: an irrational belief arising from ignorance or fear

superstitious notion (noun)	superstition (noun)
an irrational belief arising from ignorance or fear	an irrational belief arising from ignorance or fear