metonymy vs metalepsis

metonymy and metalepsis both are nouns.

Word	Noun	Adjective	Verb	Adverb
metonymy	Yes	No	No	No
metalepsis	Yes	No	No	No

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

metonymy: substituting the name of an attribute or feature for the name of the thing itself (as in `they counted heads')
metalepsis: substituting metonymy of one figurative sense for another

metonymy (noun)	metalepsis (noun)
substituting the name of an attribute or feature for the name of the thing itself (as in `they counted heads')	substituting metonymy of one figurative sense for another