annotate vs note

annotate is not a noun while note is a noun.

Word	Noun	Adjective	Verb	Adverb
annotate	No	No	Yes	No
note	Yes	No	Yes	No

annotate (noun)	note (noun)
	a characteristic emotional quality
	a brief written record
	a comment or instruction (usually added)
	a short personal letter
	a notation representing the pitch and duration of a musical sound
	a tone of voice that shows what the speaker is feeling
	a promise to pay a specified amount on demand or at a certain time
	a piece of paper money (especially one issued by a central bank)
	high status importance owing to marked superiority

annotate (verb)	note (verb)
provide interlinear explanations for words or phrases	make mention of
add explanatory notes to or supply with critical comments	make a written note of
	notice or perceive
	observe with care or pay close attention to