window-dress vs dress up

window-dress and dress up both are verbs.

Word	Noun	Adjective	Verb	Adverb
window-dress	No	No	Yes	No
dress up	No	No	Yes	No

As verbs, window-dress and dress up are synonyms defined as:

window-dress and dress up: make something appear superficially attractive

window-dress (verb)	dress up (verb)
make something appear superficially attractive	put on special clothes to appear particularly appealing and attractive
	dress in a costume
	dress in a certain manner
	make something appear superficially attractive
	put a caparison on