my file

$ sort --reverse /usr/share/dict/words | head -n 20 | awk -v hrl=20 -v padding=30 -v hr="x" -f ./hr-with-string.1.awk
------------------------------            zythum            ------------------------------
------------------------------            zythem            ------------------------------
------------------------------            zymurgy           ------------------------------
------------------------------           zymotoxic          ------------------------------
------------------------------           zymotize           ------------------------------
------------------------------          zymotically         ------------------------------
------------------------------            zymotic           ------------------------------
------------------------------          zymotechny          ------------------------------
------------------------------         zymotechnics         ------------------------------
------------------------------         zymotechnical        ------------------------------
------------------------------          zymotechnic         ------------------------------
------------------------------          zymosthenic         ------------------------------
------------------------------          zymosterol          ------------------------------
------------------------------            zymosis           ------------------------------
------------------------------          zymosimeter         ------------------------------
------------------------------           zymoscope          ------------------------------
------------------------------          zymoplastic         ------------------------------
------------------------------           zymophyte          ------------------------------
------------------------------         zymophosphate        ------------------------------
------------------------------          zymophoric          ------------------------------