I'm wondering if there exists a dictionary for the more technical terms used in the Moreh Nevuchim? (Any of the translations). I know I could just use an English translation and match up the words, but a dictionary would be more useful.
Yes, this is a book dedicated to that:
Philosophical Terms in the Moreh Nebukim, by Israel Efros.
Also, appended to the end of standard editions of ibn Tibbon's translation is ibn Tibbon's Peirush ha-Milim ha-Zarot, which is a glossary of philosophical terms.
Sefer Ruach Chen. is an introductory book meyuchas to Rabbi Yehuda Ibn Tibbon. A very valuable tool.