Anti-Semitism the term was coined specificaly about Jews by a 19th century German philosopher whose name eludes me.
Judophobia was coined by Herzl to explain why wherever Jews live among other nations there will be Anti-Semetism.
Broadly speaking, there are two forms of it, classic and modern Anti-Semitism. Classic Anti-Semetism, such as was found in Europe until the 18th C, was based on religion primarily. The modern variety is based on race and nation, IE the Jew cannot do a thing to change his Jeiwhsness, while in the classic kind you could theoreticay change this by converting. The Arab world is taking a backwards slide, from having the most enlightened treatment of Jews (mostly) during the Medieval era, where all you had to do was pay taxes if a non-Muslim and it was an instituitonalised discrimination, to today's situation where it gets worse daily.