litotes vs tapinosis

litotes and tapinosis both are nouns.

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

As nouns, tapinosis is a hyponym of litotes; that is, tapinosis is a word with a more specific, narrower meaning than litotes:

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

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