AKJV - The American KJV, the EXACT SAME TRANSLATION as the KJV, but with modernized word-endings.
AV - Authorized Version, of 1611 (another name for the KJV).
KJV - King James Version, of 1611; also sometimes called the Authorized Version.
Majority Text - the vast majority of ancient Greek Scripture fragments; consistent with the KJV source texts.
RT - Received Text i.e. the English, for the Latin name: TR - Textus Receptus.
TR - Textus Receptus (a.k.a. Received Text); the 5000+ Scripture portions preserved by the saints; i.e. the Greek underlying the KJV.
Westcott & Hort - Two non-Christians of the late 19th Century who made a corrupted Greek text from a few scrolls preserved by the "scholars"; i.e. the corrupted Greek underlying most modern translations.