Warn about missing terms and removed stopwords

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

:exclamation: No coverage uploaded for pull request base (master@8c8fb46). Click here to learn what that means.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #563 +/- ## ========================================= Coverage ? 93.21% ========================================= Files ? 91 Lines ? 4483 Branches ? 0 ========================================= Hits ? 4179 Misses ? 304 Partials ? 0 ```

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