olemus
Wiktionary:
1. a set of items or amount of material procured or gathered together
The attic contains a remarkable collection of antiques, oddities, and random junk.
The asteroid belt consists of a collection of dust, rubble, and minor planets.
2. multiple related objects associated as a group

näiteid
https://en.wikipedia.org/wiki/Collection_(museum)

https://en.wikipedia.org/wiki/Private_collection