Oh goodness okays so I love this question.
My favorite word used to be ambidextrous because it sounds so gosh darn awesome. If isn't a cool word really, as far as meaning goes, but I mean just say it. Tis way awesome!!
I also really like the word, crimson. It makes me think of blood, royalty, and my cat who is dark and awesome.
My number one favorite word though, is colorful because I love colors and the word makes me see lots of colors and I get so happy!!!!