mumpsimus vs notion

mumpsimus and notion both are nouns.

Word	Noun	Adjective	Verb	Adverb
mumpsimus	Yes	No	No	No
notion	Yes	No	No	No

As nouns, notion is a hypernym of mumpsimus; that is, notion is a word with a broader meaning than mumpsimus:

mumpsimus: a traditional notion that is obstinately held although it is unreasonable
notion: a general inclusive concept

mumpsimus (noun)	notion (noun)
a traditional notion that is obstinately held although it is unreasonable	(usually plural) small personal articles or clothing or sewing items
	a general inclusive concept
	an odd or fanciful or capricious idea
	a vague idea in which some confidence is placed