crotchet vs musical note

crotchet and musical note both are nouns.

Word	Noun	Adjective	Verb	Adverb
crotchet	Yes	No	No	No
musical note	Yes	No	No	No

As nouns, musical note is a hypernym of crotchet; that is, musical note is a word with a broader meaning than crotchet:

crotchet: a musical note having the time value of a quarter of a whole note
musical note: a notation representing the pitch and duration of a musical sound

Other hypernyms of crotchet include note, tone.

crotchet (noun)	musical note (noun)
a small tool or hooklike implement	a notation representing the pitch and duration of a musical sound
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