dressed-up vs spiffed up

dressed-up and spiffed up both are adjectives.

Word	Noun	Adjective	Verb	Adverb
dressed-up	No	Yes	No	No
spiffed up	No	Yes	No	No

As adjectives, dressed-up and spiffed up are synonyms defined as:

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

dressed-up (adjective)	spiffed up (adjective)
dressed in fancy or formal clothing	dressed in fancy or formal clothing