Are you aware of the "texcount" program [0] that's distributed with TeX Live by default?

[0]: https://ctan.org/pkg/texcount?lang=en

  detex "$@" | wc
  detex "$@" | tr -cs '[:alnum:]' '\n' | grep . | tr '[:upper:]' '[:lower:]' | sort | uniq -c | sort -rn

We need a link!