/usr/share/myspell/dicts/hyph_en_US.dic is in hyphen-en-us 2.8.8-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/myspell/dicts/../../hyphen/hyph_en_US.dic
/usr/share/myspell/dicts/../../hyphen/hyph_en_US.dic