annotation vs notation

annotation and notation both are nouns.

Word	Noun	Adjective	Verb	Adverb
annotation	Yes	No	No	No
notation	Yes	No	No	No

As nouns, annotation and notation are synonyms defined as:

Other synonyms of annotation include note.

annotation (noun)	notation (noun)
the act of adding notes	the activity of representing something by a special system of marks or characters
a comment or instruction (usually added)	a technical system of symbols used to represent special things
	a comment or instruction (usually added)