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

is a broader term that covers: Feast of Booths, Feast of Tabernacles, Succos, Succoth, Sukkoth, Tabernacles | Rosh Chodesh, Rosh Hodesh | High Holiday, High Holy Day | Purim | Feast of Weeks, Pentecost, Shabuoth, Shavous, Shavuot, Shavuoth | Rejoicing in the Law, Rejoicing of the Law, Rejoicing over the Law, Shimchath Torah, Simchas Torah, Simchat Torah, Simhat Torah, Simhath Torah | Fast of Ab, Fast of Av, Ninth of Ab, Ninth of Av, Tisha b'Ab, Tisha b'Av, Tishah b'Ab, Tishah b'Av | Channukah, Channukkah, Chanukah, Chanukkah, Feast of Dedication, Feast of Lights, Feast of the Dedication, Festival of Lights, Hannukah, Hanukah, Hanukkah | Lag b'Omer.