hiccough? I'm pretty sure it's hiccup.
Many words have alternate spellings.
Many don't, what's your point?
You implied hiccough is spelled hiccup, while hiccough is just as correct of a spelling. CMIIW.
Hiccup is a word imitative of the sound, first documented by the OED in 1580 as replacing an earlier Hiccock which had cognates in Dutch, Old Norse, etc.. Hiccough is a respelling by the ignorant anxious to suggest an incorrect etymology and is first found around the time (mid 17th century) when GH had survived its general demise in a few words (rough, tough, cough) by mispronunciation as F.Fowler's "Modern English Usage" derides this spelling as a popular error that ought to be shunned. It may be more frequent in British than in North American English, but that does not make it in any way "correct." I find to my disgust and amazement that my Yahoo word processor approves of the abominable "hiccough."
Here's a guy who pretty passionately disagrees with you:http://uk.answers.yahoo.com/question/index?qid=20110818195029AAVrPQu
Former President George H.W. Bush is shown with the 2-year-old son of a member of Bush's Secret Service detail. Bush recently had his head shaved to show support for the boy, who lost hair because of leukemia treatments.
WTH?
Charter. Very interesting. http://www.linearair.com/