The mitzvot (Torah-commands).
Clergy for Judaism are called rabbis.
Judaism was in what is now called Israel. Its holy book is the Tanakh, which contains the Torah and the prophetic books.
They are called Jews.
Judaism is called Judaism.
They are Jewish and they're called Jews.
Reformed Judaism believes that the Bible is the main source for the rules of Judaism.
Judaism's real name, in English, is "Judaism".
The Torah.
Until the time of Moses, it may have been named only by its parts: Yir'at Hashem (awareness of God), etc. From the time of Moses onwards, it was simply called Torah. "Judaism," as we call it today, is a description that was coined later.
A practitioner of Judaism is called a Jew. A Jewish religious authority is called a rabbi.
Judaism. And today we no longer prefer the name Hebrews. Rather, we're called Jews.
Jewish law is called 'halacha'.