solidness vs reliability

solidness and reliability both are nouns.

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

As nouns, reliability is a hypernym of solidness; that is, reliability is a word with a broader meaning than solidness:

solidness: the quality of being solid and reliable financially or factually or morally
reliability: the quality of being dependable or reliable

Other hypernyms of solidness include dependability, dependableness, reliableness.

solidness (noun)	reliability (noun)
the quality of being substantial or having substance	the quality of being dependable or reliable
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