dress vs dress up

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

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

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

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

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

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

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

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

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

dress (verb)	dress up (verb)
put on clothes	put on special clothes to appear particularly appealing and attractive
provide with clothes or put clothes on	dress in a costume
apply a bandage or medication to	dress in a certain manner
arrange attractively	make something appear superficially attractive
dress or groom with elaborate care	put a caparison on
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