"Gh" Pronounced as "P"

(Eugene Volokh)

In what English word (which is not a proper name) is "gh" pronounced as "p"? For a possibly not very helpful hint, see below.

The more common alternative spelling of this word does indeed render the sound using the letter "p." But the "gh" spelling is still common enough to be listed in dictionaries, and to get hundreds of thousands of Google hits.