tapinosis vs litotes

tapinosis and litotes both are nouns.

Word	Noun	Adjective	Verb	Adverb
tapinosis	Yes	No	No	No
litotes	Yes	No	No	No

As nouns, litotes is a hypernym of tapinosis; that is, litotes is a word with a broader meaning than tapinosis:

tapinosis: (rhetoric) A figure of speech whereby something is given less importance by the name given it than it merits.
litotes: understatement for rhetorical effect (especially when expressing an affirmative by negating its contrary)

Other hypernyms of tapinosis include meiosis.

tapinosis (noun)	litotes (noun)
(rhetoric) A figure of speech whereby something is given less importance by the name given it than it merits.	understatement for rhetorical effect (especially when expressing an affirmative by negating its contrary)