This is a helpful list of the classifications used for dreams that I experience. I like having them categorized for easier viewing, and also it helps the reader understand how they made me feel at the time.

"Interesting" and "Nightmare"-type dreams have been the most common lately for some reason.

Interesting: A dream that is confusing and/or thought-provoking. Overlaps with nightmares sometimes, but not usually as scary.
Nightmare: Self-explanatory, I think. Everyone has them, but I fear I have "bad dreams" more often than most.
Realistic: A dream that is very close to real life. I have these frequently, typically I'll be at work or at the store like any other day in reality.
Happy: A dream that evokes pleasant feelings, like buying new clothes or flying.