I enjoy interesting, fun words. Occasionally I'll sneak on in one of my novels.
Here's an interesting word: Brobdingnagian. It comes from Gulliver's Travels and means "big, really really big."
Another fun word is crepuscular. which means "of, relating to, or resembling twilight. Also dim." But if you add "rays" to it (as in crepuscular rays), it means the rays of light that come out of the sky from clouds. Also called "God's rays."
Phosphenes are the lights you see when you close your eyes. The lights that get more active when you rub your eyes in the dark.
And pareidolia means seeing shapes (such as faces) in random stimulus. Such as phosphenes. Or seeing shapes in clouds.
Oh, and hebdomadal? That means occurring once a week.
Do you know any more interesting words. I'd love to learn them. Let me know in the comments below.