Rabbinical student
You cannot (just by looking). A rabbi generally dresses like any other observant Jew.
A Jew that does circumcision is called a Mohell
I believe the correct form of address is Reb, but you could also use the respectful term, sir.
Well, honey, if you're talking about addressing a Rabbi as a title, then yes, you capitalize it out of respect. But if you're just talking about the general term "rabbi," then no need for the fancy capitalization. So, it all depends on the context, darling.
Rabbis don't preach. However the rabbi (or any leader) of a prayer service will usually be found at the bimah, which is rarely called an almemar.Note: A Jewish prayer service does not require a rabbi.
An Atheist, because an Atheist has no religion.
Originally, it was a rabbi, a rabbi, and a rabbi walk into a bar. . .
Rabbis. Here are a few examples from the Talmud. Rabbi Yochanan ben Zakkai, Rabbi Yonatan ben Uziel, Chanina ben Dosa, Bava ben Buta, Shimon ben Hillel, Rabbi Eliezer, Rabbi Yehoshua, Rabbi Yossi haKohen, Rabbi Shimon ben Netanel, Rabbi Elazar ben Arakh, Rabbi Yochanan ben Nuri, Rabbi Akiva, Rabbi Nechuniah, Rabbi Nachum Gamzu, Rabbi Yossi Glili, Rabbi Honi Me'agel, Rabbi Abba Shaul, and hundreds of others. Each of these had large groups of disciples.
Rabbi Aaron Teitelbaum and Rabbi Zalman Leib Teitelbaum
The rabbi of France
A rabbi is a teacher.
A Chief Rabbi