Follow-up Comment #2, bug #66016 (group groff): [comment #0 original submission:]
> .hw word
> Specify hyphenation points in words with embedded minus signs.
> Versions of a word with a terminal s are implied; i.e., dig-it
> implies dig-its.
Fun fact about this: the additional s is implied even in words that already
end in s.
As a coding shortcut, this is not entirely irrational: nouns and verbs are
typically the only words where adding an s makes sense, and vanishingly few of
these outside of proper nouns have a root form that already ends in s, since
adding the s is what changes the number.
You can see the effect by giving .hw an absurd breaking such as me-llif-luous.
Groff then hyphenates the word "mellifluous" using the absurd break points,
but hyphenates (the nonword) "mellifluouss" as usual. Heirloom troff
hyphenates both using the absurd breaking.
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