Usage Note
Collectionner is a regular -er verb meaning to collect items as a hobby. The noun collectionneur (m) / collectionneuse (f) is the collector. It is distinct from rassembler (to gather/assemble) in that it implies an ongoing, curated hobby collection rather than a one-off act of bringing things together.
Examples
"Il collectionne les timbres depuis l'enfance."
Natural Translation
He has been collecting stamps since childhood.

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