time note vs promissory note

time note and promissory note both are nouns.

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

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

time note: a note that specifies the time (or times) of repayment
promissory note: a promise to pay a specified amount on demand or at a certain time

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

time note (noun)	promissory note (noun)
a note that specifies the time (or times) of repayment	a promise to pay a specified amount on demand or at a certain time