note of hand vs debt instrument

note of hand and debt instrument both are nouns.

Word	Noun	Adjective	Verb	Adverb
note of hand	Yes	No	No	No
debt instrument	Yes	No	No	No

As nouns, debt instrument is a hypernym of note of hand; that is, debt instrument is a word with a broader meaning than note of hand:

note of hand: a promise to pay a specified amount on demand or at a certain time
debt instrument: a written promise to repay a debt

Other hypernyms of note of hand include certificate of indebtedness, obligation.

note of hand (noun)	debt instrument (noun)
a promise to pay a specified amount on demand or at a certain time	a written promise to repay a debt