dressed to the nines vs dressed-up

dressed to the nines and dressed-up both are adjectives.

Word	Noun	Adjective	Verb	Adverb
dressed to the nines	No	Yes	No	No
dressed-up	No	Yes	No	No

As adjectives, dressed to the nines and dressed-up are synonyms defined as:

dressed to the nines and dressed-up: dressed in fancy or formal clothing

Other synonyms of dressed to the nines include dolled up, dressed, dressed to kill, spiffed up, spruced up, togged up.

dressed to the nines (adjective)	dressed-up (adjective)
dressed in fancy or formal clothing	dressed in fancy or formal clothing