Nouns:
* Abstract Concepts: happiness, sadness, kindness, darkness, goodness, awareness, tiredness, loneliness, stubbornness, willingness, brightness, emptiness, etc.
* States of Being: illness, sickness, weakness, blindness, deafness, richness, poverty, nakedness, etc.
* Qualities: hardness, softness, smoothness, roughness, redness, blueness, sweetness, sourness, etc.
Adjectives:
* Derived from Nouns: businesslike, homeless, careless, thoughtless, etc.
The "-ness" suffix usually turns an adjective or verb into a noun, indicating a state, quality, or condition.