note of hand vs obligation

note of hand and obligation both are nouns.

Word	Noun	Adjective	Verb	Adverb
note of hand	Yes	No	No	No
obligation	Yes	No	No	No

As nouns, obligation is a hypernym of note of hand; that is, obligation 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
obligation: a written promise to repay a debt

Other hypernyms of note of hand include certificate of indebtedness, debt instrument.

note of hand (noun)	obligation (noun)
a promise to pay a specified amount on demand or at a certain time	the social force that binds you to the courses of action demanded by that force
	a legal agreement specifying a payment or action and the penalty for failure to comply
	a written promise to repay a debt
	a personal relation in which one is indebted for a service or favor
	the state of being obligated to do or pay something