Ḥasīd is a Jewish honorific, frequently used as a term of exceptional respect in the Talmudic and early medieval periods.
In Israel, among the Haredim, Rabbi can be used colloquially interchangeably with the Yiddish Reb, and is used as a friendly title, similar to calling someone "Sir".
When used alone, "the Rav" refers to the posek (Jewish legal decisor) whom the speaker usually consults, or, in Modern-Orthodox communities, to Joseph B. Soloveitchik.
Rebbe may refer to the leader of a Hasidic Judaism movement, a person's main rosh yeshiva (in most institutions, the dean of the academy; at others, such as RIETS, a sort of tenured lecturer) or mentor, or to an elementary school teacher as referred to by his/her students.
Tzadik is a honorific title in Judaism given to people considered righteous, such as biblical figures and later spiritual masters.
Mar (מר, Aramaic for "master") was a high honorific for teachers and Exilarchs in the Talmudic and Geonic periods, but Modern Hebrew adopted it as "Mr.".
Morah is feminine, and can be used for any teacher; Moreh is masculine, and typically reserved for non-Judaics subjects (where Rav or Rabbi is used irrespective of ordination status).
"Admor" is a modern acronym for "Adonainu, Morainu, VeRabbeinu", a phrase meaning "Our Master, Our Teacher, and Our Rabbi".
This is an honorific title given to scholarly leaders of a Jewish community, exclusively to Hasidic rebbes.
This term is used to point to a leader of the generation, for example, Aharon Yehuda Leib Shteinman was considered one until his death in 2017.
It is also the primary title of Karaite spiritual leaders, perhaps on the Sephardic model but also to emphasize their role as advisors rather than authorities.
The Beta Israel community of Ethiopia refers to its spiritual leaders as Qessoch ቄሶች, sometimes translated as "pastors" or "sages".
[4][c] Having reverted to the original meaning, it is now placed after the name of any revered rabbi, especially one with whom the speaker has a personal connection, but the gershayim (indicating an acronym) is still often used.