The word קבותם is not Hebrew.

[ronsivan]

It is possible that it was picked from a Web page as misspelled קבורתם - I've encountered pages with such misspelling, but that does not make it a legitimate word...

[Hugo0]

Thanks for reporting! Hebrew word list quality is a known major issue — the list has 64k+ words including many invalid forms. This is tracked in #110 as a dedicated curation effort. Frequency-ranking (PR #118) helps prioritize common words, but a proper manual curation is still needed. We'd welcome community help on this!