sell up vs sell

sell up is not a noun while sell is a noun.

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

sell up (noun)	sell (noun)
	the activity of persuading someone to buy

sell up (verb)	sell (verb)
sell or get rid of all one's merchandise	persuade somebody to accept something
	exchange or deliver for money or its equivalent
	do business; offer for sale as for one's livelihood
	give up for a price or reward
	deliver to an enemy by treachery
	be sold at a certain price or in a certain way
	be responsible for the sale of
	be approved of or gain acceptance