peculiarity vs foible

peculiarity and foible both are nouns.

Word	Noun	Adjective	Verb	Adverb
peculiarity	Yes	No	No	No
foible	Yes	No	No	No

As nouns, foible is a hyponym of peculiarity; that is, foible is a word with a more specific, narrower meaning than peculiarity:

peculiarity: a distinguishing trait
foible: a behavioral attribute that is distinctive and peculiar to an individual

Other hyponyms of peculiarity include idiosyncrasy, mannerism.

peculiarity (noun)	foible (noun)
something unusual -- perhaps worthy of collecting	the weaker part of a sword's blade from the forte to the tip
a distinguishing trait	a behavioral attribute that is distinctive and peculiar to an individual
an odd or unusual characteristic	a minor flaw or shortcoming in character or behavior.