couth vs perfection

couth and perfection both are nouns.

Word	Noun	Adjective	Verb	Adverb
couth	Yes	Yes	No	No
perfection	Yes	No	No	No

As nouns, perfection is a hypernym of couth; that is, perfection is a word with a broader meaning than couth:

Other hypernyms of couth include flawlessness, ne plus ultra.

couth (noun)	perfection (noun)
(used facetiously) refinement	the act of making something perfect
	an ideal instance; a perfect embodiment of a concept
	the state of being without a flaw or defect

couth (adjective)	perfection (adjective)
(used facetiously) refined and well-mannered