metonymical vs metonymic

metonymical and metonymic both are adjectives.

Word	Noun	Adjective	Verb	Adverb
metonymical	No	Yes	No	No
metonymic	No	Yes	No	No

As adjectives, metonymical and metonymic are synonyms defined as:

metonymical and metonymic: using the name of one thing for that of another with which it is closely associated

metonymical (adjective)	metonymic (adjective)
using the name of one thing for that of another with which it is closely associated	using the name of one thing for that of another with which it is closely associated