Prefixes and Suffixes

Level 1 · un- re-
Level 2 · un- re- pre-
Level 3 · dis- mis- un- re-
Level 4 · -ful -less
Level 5 · -ness -ly
Level 6 · -ful -less -ness -ly -er
Level 7 · un- re- -ful -less
Level 8 · dis- mis- -ness -ly
Level 9 · pre- -er -able un- -ful
Level 10 · un- re- pre- dis- mis- -ful -less -ness -ly -er -able