thinness vs runniness

thinness and runniness both are nouns.

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

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

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

thinness (noun)	runniness (noun)
the property of having little body fat	the property of flowing easily
relatively small dimension through an object as opposed to its length or width
a consistency of low viscosity
the property of being very narrow or thin
the property of being scanty or scattered; lacking denseness
The property of lacking substance or strength.