Favor vs. Favour: A Field Guide to the -or/-our Word Family

One Word, Two Spellings

Open a US newspaper and you'll read that a senator did the president a favor. Open a UK one and it's a favour. Same word, same meaning, one letter apart, and that gap didn't happen by accident.

The split traces to Noah Webster, an American lexicographer who spent decades arguing that a new nation needed its own version of English, distinct from the one it had just fought a war to leave behind. His 1806 dictionary, and the far more influential 1828 An American Dictionary of the English Language, trimmed a batch of French-derived words that English had inherited with a silent u: honour, colour, labour, favour. Webster's case was partly practical, that the u served no purpose in pronunciation and only added ink and confusion, and partly political, that an independent country deserved spelling conventions of its own.

Britain kept the older spelling. The United States, still assembling its cultural identity, largely adopted Webster's version over the following decades, helped along by his textbooks landing in American classrooms for generations. Two centuries later, the -or/-our divide is one of the clearest fingerprints for telling American writing from British writing at a glance, more reliable than most other spelling differences, and one of the few word families where a single missing letter reveals exactly which side of the Atlantic, or which style guide, a writer is following.

The Core -or / -our Pairs

Where Each Spelling Is Standard

American spelling, favor, color, honor, is standard throughout the United States: in publishing, government documents, and US style guides such as AP and Chicago.

The -our spelling is standard across the UK, Ireland, Australia, New Zealand, South Africa, and most other Commonwealth countries, along with international style guides like Oxford and Cambridge. Academic journals and publishers based in these countries will usually specify -our spelling in their house style, and copy that arrives with American forms tends to get flagged in editing.

Canada sits in between and resists a clean rule. Federal style guides and most Canadian newspapers favour the British spellings for this particular word family, favour, colour, honour, but Canadian English leans American on other points, including -ize verb endings such as organize rather than organise. Usage also varies by publication, region, and how much a given writer's reading diet skews American. Treat Canadian spelling as a leaning, not a fixed rule, and check the specific outlet's style guide before assuming either way.

Where British Drops the U Too

• Honour becomes honorary and honorific, no u, in British spelling as well as American.
• Humour becomes humorous and humorist.
• Labour becomes laborious.
• Vigour and rigour become vigorous and rigorous.
• Even glamour, which keeps its u in both countries, turns into glamorous.

Why the U Disappears

The pattern isn't random. When one of these words takes a suffix that shifts the stress, such as -ous, -ary, -ic, or -ist, the u tends to fall away even in British spelling, because the syllable it was cushioning no longer carries the same emphasis. Suffixes like -able and -ful, by contrast, leave the u in place: favourable, colourful, honourable, humourless. If you're proofreading British text and spot honorary without a u, that's not an inconsistency to correct; it's the rule working exactly as intended.

This is worth knowing because it's the detail that trips up automated find-and-replace fixes. Swapping every honor for honour across a document will wrongly turn honorary into honourary, which is a spelling that doesn't exist in either system. Blanket search-and-replace is a blunt tool for this particular problem; it needs a human, or a proper editing pass, checking each hit.

Picking a System and Holding the Line

None of this matters much until you're writing for a specific audience, at which point consistency becomes the whole game. A document that mixes favor in paragraph one and favour in paragraph four reads as careless, even if every individual sentence is grammatically sound.

The fix is procedural, not linguistic: decide who you're writing for, pick the dictionary or style guide that matches, AP or Merriam-Webster for American, Oxford or Cambridge for British, and apply it uniformly across the whole piece, headlines, body text, captions, and any boilerplate pasted in from elsewhere.

Watch especially for text assembled from multiple sources: a report stitched together from contributors in different countries, or a paragraph copied from a UK press release into an otherwise American blog post. That's where -or and -our start turning up side by side, and where a single overlooked sentence can undercut an otherwise polished piece.

Catching the Slip

Spell-check alone won't catch this, because favor and favour are both correctly spelled words, just in different dictionaries. What actually helps is a check built to flag regional inconsistency, not only typos. AI Humanizer Lab's free Grammar Checker does exactly that: run a draft through it and it will surface -or/-our mismatches, and other US/UK spelling variants, so you can settle on one system before you publish, rather than after a reader points it out.