Wow. You know the ‘urves’ part is really hard to pronounce phoenetically. Hey! There’s another word!
Maintenance.
I always think it should be Maintainance.
To me, convenience is no real convenience to spell.
“Two” has a w sound that’s not needed. Gallagher once commented that it should go to “one” that needs it.
Of is the only word where F becomes a V.
I will second all of the issues the Ough have.
Doubt has a b in it. I once read that the only reason it does, is because the latin word for doubt had a b in it. – I don’t doubt that.
pneumonia
Really? a P ?! How in the world would you “look it up” if you had to?
Somewhat related to the issue: Can’t we standardize names ?
“Lindsay” alone gets close to 3 Dozen spellings.
No Offense intended. It’s a name that illustrates my point precisely. I’m sorry if you just happen to be a
Lindsay, Lendsay, Lyndsay, Lyndzee, Lyndsie, Lyndsy, Lindsey, Lindsie, Lindzie, Lendsey, Lindzee, Lendzee, Lindsee, Lendsee, Lindzi, Lindzie, Linsay, Lensay, Lynsay, Lynzee, Lynsie, Lynsy, Linsey, Linsie, Linzie, Lensey, Linzee, Lenzee, Linsee, Lensee, Linzi, Linzie,
Or some other variant of E/I and D or no D, and S or Z, and E, I, IE, Y I somehow forgot.
Hopefully I made my point.
I see that someone simulposted my Doubt. (A lot of simulposts actually)
Sorry, I was busy trying to tackle how to spell Lindsay.
Epitome. I always see it as epi-tome, and in fact pronounced it that way for a long time before being corrected many years ago.
February can kiss my ass.
Pronunciation. Why isn’t it “pronounciation”?
Pretty much anything French. I can never figure out how to pronounce French-derived words.
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Also, British spelling. I can live with “humour” and “colour” if I have to, but “programme”? “Tonne”? “Gaol”?
That last one is only ever pronounced as “prison”. 
Really, though, no one uses the word gaol. Jail is an Americanism, so you sometimes hear it, but by and large the place where criminals end up in is prison.
I remember it because I was in elementary school when the NES hit the scene… and always remember its spelling because of that… :o
Jail, the word, is not an Americanism. Oscar Wilde wasn’t American. Gandhi wasn’t sent to jail in America.
What’s American is the distinction made between jail (a temporary holding facility – at least one in each county or city) and prison (one of a handful of state or federal facilities where people convicted of crimes are held as punishment).
Ditto. French is a fucked-up language.
If you could write it is instead, use it’s. Its is analogous to his, hers, ours, and theirs.
‘Business’ looks like it should be pronounced Bussy-ness, why isn’t it spelled ‘bizness’
I did not know the difference between an American jail and an American prison, so thank you for that.
Wilde and Ghandi have both been dead for a very long time. No one uses the gaol spelling now, is all.
Heighth isn’t a word, it’s an archaic pronunciation.
Misspelling - because I hate the irony
Tonne is not an alternative spelling of “ton” - it is a word in its own right with a (slightly) different meaning. A “ton” is an Imperial measure of weight, and is 2,240 lbs (outside of North America, which has its own “ton” or “short ton” of 2,000 lbs). A “tonne” is a metric ton, i.e. 1,000 kilograms, or 2,205 pounds.
Gauge
It should be spelled gage
Also bass (in music) should be spelled base
colour
I also hate when they make up an abbreviation that is one letter short of the original word they couldn’t type out or something like this. Computer - Computi
“Through” too damn many letters. For some reason, I don’t have a problem with “though,” though.
Slightly off topic, but you know that cutesy thing of using “z” for the plural? (boys -> boyz) I’m OK with that except when they do it for words that end in an unvoiced “s”. Remember that movie Antz? You don’t say “antzzz”; you say “antsss”. (OK, bad example, because maybe the title was actually Ant Z since the character’s name was “Z”.)