monotony vs stability

monotony and stability both are nouns.

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

As nouns, stability is a hypernym of monotony; that is, stability is a word with a broader meaning than monotony:

Other hypernyms of monotony include constancy.

monotony (noun)	stability (noun)
the quality of wearisome constancy, routine, and lack of variety	the quality or attribute of being firm and steadfast
constancy of tone or pitch or inflection	the quality of being enduring and free from change or variation
	a stable order (especially of society)