prettify vs dress up

prettify and dress up both are verbs.

Word	Noun	Adjective	Verb	Adverb
prettify	No	No	Yes	No
dress up	No	No	Yes	No

As verbs, dress up is a hyponym of prettify; that is, dress up is a word with a more specific, narrower meaning than prettify:

prettify (verb)	dress up (verb)
make more beautiful	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