"Collectionist" Natural Recordings by Native Speakers
A collectionist is a person who collects or accumulates things, such as objects, art, or memorabilia, often with great enthusiasm and dedication.
Collectable refers to something that is valuable or desirable to a particular group of people or as a hobby, and is therefore sought after and collected.
The verb "collecting" means the act of gathering or bringing together a group of things, often in a systematic or organized way. It can also refer to the process of accumulating or amassing something, such as money, data, or items, usually over a period of time.