1.  stamp collection(n = noun.group) - a collection of stamps;
is a kind of accumulation, aggregation, assemblage, collection

2.  stamp collection(n = noun.act) philately, stamp collecting - the collection and study of postage stamps;
is a kind of aggregation, assembling, collecting, collection
has particulars: aerophilately

art collection, bottle collection, coin collection, collection, collection agent, collection plate, date stamp, food stamp, garbage collection, loan collection, map collection, motley collection, postage stamp, rental collection, revenue stamp, rubber stamp, stamp, stamp act, stamp album, stamp battery, stamp collecting, stamp collector, stamp dealer, stamp down, stamp duty, stamp mill, stamp out, stamp pad, stamp tax, tax collection, trading stamp, trash collection