It is neither: it is a proper noun for a holiday.(In 'Easter Sunday' it is a noun adjunct with the proper noun Sunday.)
Common noun
The noun 'Sunday' is a proper noun, the name of a specific day; and an abstract noun, a word for a concept of time.
The noun 'Sunday' is a singular, proper noun.A predicate nominative is a noun or pronoun that follows a linking verb and restates the subject of the sentence.The noun 'Sunday' can function as a predicate nominative; for example:Today is Sunday. (the noun 'Sunday' restates the subject of the sentence 'today')The day that we went to the festival was a Sunday.The first day of the month is a Sunday.
Sunday is a proper noun
The common noun for the proper noun Easter Sunday is either holiday or holy day.
It is neither: it is a proper noun for a holiday.(In 'Easter Sunday' it is a noun adjunct with the proper noun Sunday.)
The common noun for Sunday is day.
Common noun
It is a proper noun, as a Sunday is a specific day. Day would be a common noun, but Sunday or Sundays, its plural form, is a proper noun.
The noun 'Easter Island' is a proper noun, the name of a specific place.
Low Sunday
Sunday is a proper noun because it gives a specific day. example you could say day which is a common noun but if you say Sunday it being specific so it is a proper noun.
In 1992 Easter Sunday was on the 19th of April.In 1992 Easter Sunday was on the 19th of April.In 1992 Easter Sunday was on the 19th of April.In 1992 Easter Sunday was on the 19th of April.In 1992 Easter Sunday was on the 19th of April.In 1992 Easter Sunday was on the 19th of April.In 1992 Easter Sunday was on the 19th of April.In 1992 Easter Sunday was on the 19th of April.In 1992 Easter Sunday was on the 19th of April.In 1992 Easter Sunday was on the 19th of April.In 1992 Easter Sunday was on the 19th of April.
Easter Sunday begins the Easter season which ends with Trinity Sunday.
Yes, Palm Sunday is the week before Easter.
Easter Sunday was on the 29th of March in 1964.