• Yom tov (יום טוב) is used for the festivals of Biblical origin during which melacha is prohibited. These are Rosh Hashanah, Yom Kippur, the first day(s) of Sukkot, Shemini Atzeret-Simḥat Torah, the first and last day(s) of Passover, and Shavuot.
• Moed (מועד) plural moadim (מועדים), refers to any of the Three Pilgrimage Festivals of Passover, Shavuot and Sukkot. When used in comparison to Yom Tov, it refers to Chol HaMoed, the intermediate days of Passover and Sukkot.
• Ḥag or chag (חג) ("festival"), plural chagim (חגים), can be used whenever yom tov or moed is. It is also used to describe Hanukkah and Purim, as well as Yom Ha'atzmaut (Israeli Independence Day) and Yom Yerushalayim (Jerusalem Day).
• Ta'anit (תענית), or, less commonly, tzom (צום), refers to a fast. These terms are generally used to describe the rabbinic fasts, although tzom is used liturgically to refer to Yom Kippur as well.