intercalation vs calendar

intercalation and calendar both are nouns.

Word	Noun	Adjective	Verb	Adverb
intercalation	Yes	No	No	No
calendar	Yes	No	Yes	No

intercalation (noun)	calendar (noun)
an insertion into a calendar	a list or register of events (appointments or social events or court cases etc)
	a tabular array of the days (usually for one year)
	a system of timekeeping that defines the beginning and length and divisions of the year

intercalation (verb)	calendar (verb)
	enter into a calendar