cork vs cork up

cork is a noun but cork up is not a noun.

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

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

cork (noun)	cork up (noun)
the plug in the mouth of a bottle (especially a wine bottle)
a small float usually made of cork; attached to a fishing line
outer bark of the cork oak; used for stoppers for bottles etc.
(botany) outer tissue of bark; a protective layer of dead cells

cork (verb)	cork up (verb)
stuff with cork	close a bottle with a cork
close a bottle with a cork