Hashem - The Name. The name of God is so sacred that it is generally not pronounced, and, thus, one common way of refering to God is simply as "The Name", Hashem.
Hashmal - the Speaking-Silence.
Havdalah - a short ceremony done at the conclusion of Shabbat.
Klippot - the shells or coverings which hide God's presence in the world.
Leshon Hara - malicious gossip. One the very worst things you can do.
Ma'aseh Bereshit - The Work of Creation.
Ma'aseh Merkavah - The Work of the Chariot.
Midrash - normally what you might think of as an interpretive story or parable.
Olam Haba - the world to come. It could be an afterlife or a future time.
Partzuf, Partzufim (singular/plural) - the reconstituted, interconnected sephirot after the shattering of the vessels.
Rosh Chodesh - "head of the month", the new moon.
Sephirah, Sephirot (singular/plural) - the vessels on the Tree of Life.
Shabbat - the Sabbath.
Shechinah - the feminine presence of God.
Shevirat Hakelim - the shattering of the vessels. One may also equate it with the Big Bang or the expulsion from Eden.
Tagin - crowns that are attached to certain letters in the Torah.
Tikkun Nefesh - repairing the soul.
Tikkun Olam - repairing the world.
Tzimtzum - the contraction of God's essence to create a space for the world.
Yesh m'Ayin - something from nothing.
Yesh m'Yesh - something from something.