demand note vs promissory note

demand note and promissory note both are nouns.

Word	Noun	Adjective	Verb	Adverb
demand note	Yes	No	No	No
promissory note	Yes	No	No	No

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

demand note: a note payable on demand
promissory note: a promise to pay a specified amount on demand or at a certain time

Other hypernyms of demand note include note, note of hand.

demand note (noun)	promissory note (noun)
a note payable on demand	a promise to pay a specified amount on demand or at a certain time