"Et" is a valid Scrabble word, and it is worth two points. It is the simple past tense verb form of "to eat." Additional definitions include abbreviations and acronyms, but for the purposes of playing Scrabble, only "et" as a verb form of "to eat" is permissible.
"Et" is the Latin conjunction meaning "and." "Et" can also be defined as an abbreviation that stands for Eastern Time, Egypt, elapsed time, embryo transfer, endotrachial, extraterrestrial, Estonian and ethyl. "E.T. the Extra-Terrestrial" is a film about an alien who escapes Earth with the help of a small boy who calls him E.T.