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ful:
Meaningful
Restful
Watchful
Handful
Spoonful

-ness:
Happiness
Thickness
Thankfulness
Collectiveness
Seriousness

-less:
Friendless
Thoughtless
Hatless
Nameless
Helpless

-able:
Moveable
Advisable
Drinkable
Understandable
Eatable

un-:
Untrue
Unreal
Unable
Unchangeable
Unknown

re-:
Redress
Reenter
Reopen
Reorganize
Recopy