We can also consider them as a class:
- nominalisation to form nouns
- verb formation to form verbs.
- adjective formation to form adjectives.
- adverb formation to form adverbs
There are 4 main types:
- Prefix addition, i.e. addition of prefixes
- suffix addition, i.e. addition of suffixes
- conversion, or null derivation, which involves linguistic zero
- back formation