crotchet vs oddity

crotchet and oddity both are nouns.

Word	Noun	Adjective	Verb	Adverb
crotchet	Yes	No	No	No
oddity	Yes	No	No	No

As nouns, crotchet and oddity are synonyms defined as:

Other synonyms of crotchet include queerness, quirk, quirkiness.

crotchet (noun)	oddity (noun)
a small tool or hooklike implement	something unusual -- perhaps worthy of collecting
a strange attitude or habit	a strange attitude or habit
a musical note having the time value of a quarter of a whole note	eccentricity that is not easily explained
a sharp curve or crook; a shape resembling a hook