dress vs fancy up

dress is a noun but fancy up is not a noun.

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

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

dress: put on clothes
fancy up: put on special clothes to appear particularly appealing and attractive

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

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

dress (noun)	fancy up (noun)
a one-piece garment for a woman; has skirt and bodice
clothing of a distinctive style or for a particular occasion
clothing in general

dress (adjective)	fancy up (adjective)
(of an occasion) requiring formal clothes
suitable for formal occasions

dress (verb)	fancy up (verb)
put on clothes	put on special clothes to appear particularly appealing and attractive
provide with clothes or put clothes on
apply a bandage or medication to
arrange attractively
dress or groom with elaborate care
give a neat appearance to
dress in a certain manner
kill and prepare for market or consumption
convert into leather
put a dressing on
put a finish on
cultivate, tend, and cut back the growth of
provide with decoration
cut down rough-hewn (lumber) to standard thickness and width
decorate (food), as with parsley or other ornamental foods
arrange in ranks