Difference between Extragalactic and Collection

Extragalactic

Part of speech: adjective

Definition: Originating outside of the Milky Way galaxy.

Collection

Part of speech: noun

Definition: A set of items or objects procured or gathered together by a person, group, or other agent.Multiple related objects associated as a group.The activity of collecting.

Example sentence: From a child I was fond of reading, and all the little money that came into my hands was ever laid out in books. Pleased with the 'Pilgrim's Progress,' my first collection was of John Bunyan's works in separate little volumes.