a private art collection
a valuable stamp collection
I'm going to buy the DVD named "Lord of the Rings" because I like it very much and want to have it in my DVD collection. (Preliminary English Test; B1; Greek)
We need a different organisation for the waste collection. (First Certificate in English; B2; Italian)
There's quite a collection of toothbrushes in the bathroom.
I [wear] long t-shirts and I have a collection of sweaters. (Preliminary English Test; B1; Spanish)