1.how do we call a person who collects thinngs? 2.what things can collect? 3.what themes of stamp collections do you know?

1)Collectioner
2)Books, cars, labels, flowers, coins and etc.
3)Special stamps, commemorative stamps and regular stamps

1. a collector 2. There is so many things which we can to collect, like stamps or books. 3. Thematic collections can be made around any topic you wish