This is some great discussion! I would add that the favorite word is an opportunity to write something very meaningful, and that you should be sure to enjoy
Also, perhaps the word has something to do with your intended major or study program?
Rather than thinking of how you would like to start, try writing a few sentences that might appear in the middle of the essay, and then add an intro later.
Sit staring at the computer screen and meditating on the question, breathing deep, until you hear a brilliant sentence in your mind.