The English language is confusing, no? This series reminds us that we can never take pronunciation for granted.
Each of the 26 caches in this series is missing the key word. There is a hint to each word in either where the cache is located, the type of container, or what is inside the container.
The word is NOT required to find the cache. However, the final in this series will require you to find every word in the series in order to solve it. You can use the Certitude checker on each cache to see if you solved the word. Note that the coordinates returned by Certitude are not important, however some of the Certitude checks may return an additional piece of information required for the final.
You can validate your puzzle solution with certitude.