What categories of derivational morphology do you have?

For anyone new to formal linguistic terms, derivational morphology is modifying word roots to get related words.

For instance in English you can transform a word into a different part of speech: happy (adj) -> happiness (n), deform (v) -> deformity (n) and so on.

You can also modify the meaning of a word without changing the part of speech: yellow -> yellowish, cool -> uncool, resource -> resourceful

I'm curious to see what kinds of lists you guys have.