quirkiness vs crotchet

quirkiness and crotchet both are nouns.

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

As nouns, quirkiness and crotchet are synonyms defined as:

Other synonyms of quirkiness include oddity, queerness, quirk.

quirkiness (noun)	crotchet (noun)
a strange attitude or habit	a small tool or hooklike implement
	a strange attitude or habit
	a musical note having the time value of a quarter of a whole note
	a sharp curve or crook; a shape resembling a hook