Great idea but it's easy to mistake stutters.screening.somehow for stutter.screening.somehow, and it gets worse when you consider words that are pronounced similarly but spelled very differently. If the similar words are indeed spread far apart, and not random, that might work OK, but adding a checkword, or more words with fewer different variants, could help here.
It's also a commercial, closed standard (https://what3words.com/pricing/) which is as good as a death sentence for adoption.