monthsary vs anniversary

monthsary and anniversary both are nouns.

Word	Noun	Adjective	Verb	Adverb
monthsary	Yes	No	No	No
anniversary	Yes	No	No	No

As nouns, anniversary is a hypernym of monthsary; that is, anniversary is a word with a broader meaning than monthsary:

monthsary: the one month anniversary of something
anniversary: the date on which an event occurred in some previous year (or the celebration of it)

Other hypernyms of monthsary include day of remembrance.

monthsary (noun)	anniversary (noun)
the one month anniversary of something	the date on which an event occurred in some previous year (or the celebration of it)