Focusing on the source:
* Word ending: This emphasizes the final point of the word's history.
* Word evolution: This emphasizes the changes the word underwent over time.
* Word destination: This focuses on where the word is now used, rather than where it came from.
Focusing on the meaning:
* Word meaning: This shifts the focus to the word's current definition rather than its history.
* Word usage: This highlights how the word is used in practice.
Ultimately, the best antonym for "word origin" depends on the specific context of your usage.