spiffed up vs dressed-up

spiffed up and dressed-up both are adjectives.

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

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

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

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