solid vs solidity

solid and solidity both are nouns.

Word	Noun	Adjective	Verb	Adverb
solid	Yes	Yes	No	No
solidity	Yes	No	No	No

solid (noun)	solidity (noun)
a three-dimensional object, structurally rigid, usually resistant to changes of shape or volume	the quality of being solid and reliable financially or factually or morally
the state in which a substance has no tendency to flow under moderate stress; resists forces (such as compression) that tend to deform it; and retains a definite size and shape	the consistency of a solid
matter that is solid at room temperature and pressure	state of having the interior filled with matter

solid (adjective)	solidity (adjective)
of definite shape and volume; firm; neither liquid nor gaseous
entirely of one substance with no holes inside
having length, breadth and thickness
characterized by good substantial quality
not soft or yielding to pressure
of one substance or character throughout
impenetrable for the eye
meriting respect or esteem
of a substantial character and not frivolous or superficial
financially dependable
of good quality and condition; solidly built
uninterrupted in space; having no gaps or breaks
acting together as a single undiversified whole
providing abundant nourishment
of the same color throughout