thinness vs wateriness

thinness and wateriness both are nouns.

Word	Noun	Adjective	Verb	Adverb
thinness	Yes	No	No	No
wateriness	Yes	No	No	No

As nouns, wateriness is a hyponym of thinness; that is, wateriness is a word with a more specific, narrower meaning than thinness:

Other hyponyms of thinness include fluidity, fluidness, liquidity, liquidness, runniness.

thinness (noun)	wateriness (noun)
the property of having little body fat	the property of resembling the viscosity of water
relatively small dimension through an object as opposed to its length or width	meagerness or poorness connoted by a superfluity of water (in a literary style as well as in a food)
a consistency of low viscosity	the wetness of ground that is covered or soaked with water
the property of being very narrow or thin
the property of being scanty or scattered; lacking denseness
The property of lacking substance or strength.