Hi @gracemay,
This isn’t something specific to your store. There’s been a broader, unannounced rollout to Shopify’s search engine this year, and a number of merchants across different stores and languages have reported the same pattern: products that used to be findable are suddenly no longer findable, and relevance has gotten noticeably worse. Synonyms being retired without warning fits that same pattern of a platform-side change rather than anything you did on your end.
While you wait for it to stabilize or for Shopify to respond, here’s what’s worth doing. It helps to know that Shopify’s predictive search, the dropdown that appears as someone types, and the full storefront search results page after they hit Enter, actually run on two different engines, so a fix or workaround for one won’t necessarily carry over to the other. Also worth knowing: predictive search doesn’t search the SKU field by default, it only searches title, product type, variant title, and vendor, so if the irrelevant results you’re seeing involve SKU-like or code-style search terms, that’s a separate, longstanding limitation rather than a new bug.
For an immediate stopgap while relevancy is broken, Product boosts in Search & Discovery let you manually pin your correct products to the search terms customers actually type. That won’t fix the underlying relevancy engine, but it does correct the specific searches customers use most. If you were relying heavily on synonym groups for a catalog with lots of alternate naming, like color names, regional spelling, or abbreviations, consider temporarily adding those alternate terms directly into product titles, tags, or the product type field, since those are the fields native search still reads reliably.
If your catalog is large, also check whether the issue is worse on bigger collections specifically, since native filters have been reported to become unreliable once a collection crosses several thousand products, which could be compounding what you’re seeing.
Since this is affecting multiple stores at once rather than just yours, filing a support ticket still helps get it tracked on Shopify’s end, and searching the community for other recent threads reporting the same synonym removal is worth doing too, since a visible pattern across many merchants tends to get attention faster than one ticket alone.
Best,
Vikash Jha - Apploy