solidness vs substantialness

solidness and substantialness both are nouns.

Word	Noun	Adjective	Verb	Adverb
solidness	Yes	No	No	No
substantialness	Yes	No	No	No

As nouns, solidness and substantialness are synonyms defined as:

solidness and substantialness: the quality of being substantial or having substance

Other synonyms of solidness include substantiality.

solidness (noun)	substantialness (noun)
the quality of being substantial or having substance	the quality of being substantial or having substance
the quality of being solid and reliable financially or factually or morally
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