inconstant vs stability

inconstant is not a noun while stability is a noun.

Word	Noun	Adjective	Verb	Adverb
inconstant	No	Yes	No	No
stability	Yes	No	No	No

inconstant (noun)	stability (noun)
	the quality or attribute of being firm and steadfast
	the quality of being enduring and free from change or variation
	a stable order (especially of society)

inconstant (adjective)	stability (adjective)
likely to change frequently often without apparent or cogent reason; variable