day of remembrance vs anniversary

day of remembrance and anniversary both are nouns.

Word	Noun	Adjective	Verb	Adverb
day of remembrance	Yes	No	No	No
anniversary	Yes	No	No	No

As nouns, day of remembrance and anniversary are synonyms defined as:

day of remembrance and anniversary: the date on which an event occurred in some previous year (or the celebration of it)

day of remembrance (noun)	anniversary (noun)
the date on which an event occurred in some previous year (or the celebration of it)	the date on which an event occurred in some previous year (or the celebration of it)