I can understand wanting to replicate a printed book index, but unless it's really a concordance it's not at all needed. Search works so well on every make / model of ebook reader you hardly need sync either. I use search to find the same place on a different make of ereader, which it's likely "sync" will never do that.
So being lazy and liking an exactly correct solution, I'd put a note explaining search and about adding a space before or after if too many incorrect results occur. Baffles me that there isn't a whole word option and match case option. Most people don't even use internet search well. However the Google Playstore wins the award for the worst search ever, impossible to limit results or do exact searches. Google's web search is now also poisoned by what they think you ought to see, but the ereader searches and ereader app searches return exactly what you asked for.
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