WordNet: holy day of obligation

a day when Catholics must attend Mass and refrain from servile work, and Episcopalians must take Communion

• hypernym Christian holy day

• hyponym January 1, Solemnity of Mary

• hyponym Ascension, Ascension Day, Ascension of the Lord

• hyponym Assumption, Assumption of Mary, August 15

• hyponym All Saints' Day, Allhallows, Hallowmas, Hallowmass, November 1

• hyponym December 8, Immaculate Conception

• hyponym Christmas, Christmas Day, Dec 25, Xmas

holy day of obligation

• (suomi) katolinen pyhäpäivä (alakäsite)