note has 27 distinct synonyms spread across 10 of its 13 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
a brief written record
“he made a note of the appointment”
a short personal letter
“drop me a line when you get there”
a notation representing the pitch and duration of a musical sound
“the singer held the note too long”
a tone of voice that shows what the speaker is feeling
“there was a note of uncertainty in his voice”
a characteristic emotional quality
“it ended on a sour note”
a piece of paper money (especially one issued by a central bank)
“he peeled off five one-thousand-zloty notes”
a comment or instruction (usually added)
“his notes were appended at the end of the article”
high status importance owing to marked superiority
“a scholar of great eminence”
a promise to pay a specified amount on demand or at a certain time
“I had to co-sign his note at the bank”
notice or perceive
“She noted that someone was following her”
Synonyms, antonyms and the broader and narrower relations for note come from Princeton University’s WordNet. Full sources and licences.
make a written note of
“she noted everything the teacher said that morning”