Bat Mitzvah (n): A Jewish coming-of-age ritual that marks a girl’s transition into adulthood.

Bashert (n): A Yiddish word that means destiny; a person’s soulmate.

Bubbe (n): The Yiddish word for grandmother.

Kibbitz (v): To chit chat or speak informally; to look on and offer unwelcome advice (especially at a card game).

Kvell (v): To experience profound happiness or pride in someone else or their accomplishments.

Kvetch (v): To complain or gripe. It is usually a verb but it can also be a noun (a kvetch is a person whoc omplains a great deal). 

Megillah (n): A long, involved story or account; a complicated sequence of events; everything involved in what is under consideration.

Simcha (n): A happy occasion; a joyous celebration (like a wedding or bar mitzvah).