plenty
Can I use the word "plenty" with countable nouns?
e.g. I have plenty of friends
there are plenty books in the roomthere are plenty of books in the room

(sorry for the misprint)

Question

plenty
Can I use the word "plenty" with countable nouns?
e.g. I have plenty of friends 
there are plenty books in the roomthere are plenty of books in the room

(sorry for the misprint)

Answer

Yes. "Plenty of", "lots of", "many" are a few interchangeable words here

Answer

Plenty can be used used with countable nouns.
However, plenty means more than enough. That's why I think your sentence isn't a good example of its usage. 
http://www.macmillandictionary.com/dictionary/british/plenty

Answer

there are plenty OF books in the room, but yes, you can, using 'plenty of'