preen vs dress up

preen and dress up both are verbs.

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

As verbs, dress up is a hypernym of preen; that is, dress up is a word with a broader meaning than preen:

preen: dress or groom with elaborate care
dress up: put on special clothes to appear particularly appealing and attractive

preen (verb)	dress up (verb)
dress or groom with elaborate care	put on special clothes to appear particularly appealing and attractive
pride or congratulate (oneself) for an achievement	dress in a costume
clean with one's bill	dress in a certain manner
	make something appear superficially attractive
	put a caparison on