solidity vs solid

solidity and solid both are nouns.

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

solidity (noun)	solid (noun)
the quality of being solid and reliable financially or factually or morally	a three-dimensional object, structurally rigid, usually resistant to changes of shape or volume
the consistency of a solid	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
state of having the interior filled with matter	matter that is solid at room temperature and pressure

solidity (adjective)	solid (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