This is the 1469th most frequent Catalan word.
vi
Wine.
Here, 'vi' is used as a noun referring to wine in general.
El vi negre és el meu preferit.
Red wine is my favorite.
In this case, 'vi' is again a noun and specifies a drink enjoyed during the activity.
M'agrada beure vi durant el sopar.
I like drinking wine during dinner.
'Vi' is used to describe a specific type of wine being commented on for its attributes.