is a specific kind of: holy day, religious holiday.

is a broader term that covers: quarter day | holy day of obligation | January 20, Saint Agnes's Eve | Easter Day, Easter Sunday | Palm Sunday | Passion Sunday | Good Friday | Low Sunday | Holy Saturday | Holy Innocents' Day, Innocents' Day | Septuagesima, Septuagesima Sunday | Quinquagesima, Quinquagesima Sunday | Quadragesima, Quadrigesima Sunday | Trinity Sunday | Rogation Day | Holy Thursday, Maundy Thursday | Corpus Christi | June 29, Saints Peter and Paul | Epiphany, Epiphany of Our Lord, January 6, Three Kings' Day, Twelfth day | March 19, Saint Joseph, St Joseph | Twelfth night | All Souls' Day, November 2 | Ash Wednesday | Ember Day | Advent Sunday | Fat Tuesday, Mardi Gras, pancake day, Shrove Tuesday | August 6, Transfiguration, Transfiguration Day ... show more.