Adjustor or Adjuster: Which Spelling Is Correct?

If you’ve ever filed an insurance claim or worked with legal or mechanical documents, you’ve probably seen both adjustor and adjuster. At first glance, they appear to be interchangeable, which leaves many people wondering which spelling is actually correct.

The short answer is that both adjustor and adjuster are legitimate English words, but adjuster is the preferred and far more common spelling—especially in modern English and the insurance industry. In this guide, we’ll compare adjustor or adjuster, explain when each spelling is appropriate, discuss the term insurance adjustor, and help you choose the right word with confidence.

Adjustor or Adjuster: The Quick Answer

Here’s the simple answer:

• Adjuster is the preferred spelling in modern English.
• Adjustor is also correct but is much less common.

If you’re writing for a general audience, a business, or the insurance industry, adjuster is almost always the better choice.

What Is an Adjuster?

An adjuster is someone or something that adjusts, evaluates, or modifies something.

The word is commonly used in several industries, including:

• Insurance
• Engineering
• Manufacturing
• Automotive repair
• Construction

However, the most familiar use is in insurance.

Insurance Adjuster

An insurance adjuster investigates insurance claims to determine:

• What happened
• Whether the claim is covered
• The extent of the damage
• How much compensation should be paid

Examples:

• The insurance adjuster inspected the damaged roof.
• Our adjuster contacted us within two days.
• The claim was approved after the adjuster completed the investigation.

What Is an Adjustor?

Adjustor has the same basic meaning as adjuster—someone or something that adjusts.

Although it’s recognized in dictionaries, adjustor is considerably less common in everyday English.

You’ll occasionally encounter it in:

• Older publications
• Certain legal documents
• Technical manuals
• Company or product names

In most situations, readers are much more familiar with adjuster.

Adjuster or Adjustor: What’s the Difference?

In terms of meaning, there is virtually no difference.

The distinction is mainly one of usage and preference.

Unless you’re following an organization’s official terminology, adjuster is usually the safest choice.

Insurance Adjustor vs Insurance Adjuster

One of the most frequently searched phrases is insurance adjustor.

Although you’ll occasionally see insurance adjustor, the overwhelming majority of insurance companies, licensing organizations, and industry professionals use:

Insurance adjuster

Examples:

• Insurance adjuster license
• Claims adjuster
• Property adjuster
• Auto insurance adjuster

If you’re writing about insurance careers, claims, or policies, adjuster is the preferred spelling.

Why Are There Two Spellings?

English contains many words ending in both -er and -or.

Examples include:

• Adviser / Advisor
• Inquirer / Inquiror (rare)
• Canceler / Cancelor (rare)

Historically, both endings have existed in English, but usage often shifts over time. For adjuster, the -er ending has become the dominant standard in modern English.

That’s why dictionaries typically list adjuster as the primary form while acknowledging adjustor as a variant spelling.

Examples of Adjuster in Sentences

Here are some natural examples.

Insurance

• The adjuster reviewed the accident report.
• Our insurance adjuster approved the repair estimate.
• The adjuster requested photographs of the damage.

General Usage

• The machine includes a belt adjuster.
• The brake adjuster needed replacement.
• The seat adjuster allows multiple positions.

Examples of Adjustor in Sentences

Although less common, adjustor can also be used correctly.

Examples:

• The company hired an experienced claims adjustor.
• The equipment featured a tension adjustor.
• The manual referred to the part as an adjustor.

These examples are grammatically correct, but many editors would still recommend adjuster unless a specific brand or organization uses adjustor officially.

Common Mistakes to Avoid

Here are some common misconceptions.

Mistake 1: Thinking Adjustor Is Incorrect

It isn’t.

Adjustor is a legitimate variant spelling, although it is much less common.

Mistake 2: Mixing Spellings

Choose one spelling and remain consistent throughout your writing.

Mistake 3: Using Adjustor in Insurance Articles

Because adjuster is the industry standard, it’s generally the better choice for articles about insurance.

Which Spelling Should You Use?

For most writers, the answer is simple.

Use adjuster if you’re writing:

• Blog articles
• Business documents
• Insurance content
• Academic papers
• News stories
• Professional emails

Use adjustor only if:

• You’re quoting an official title.
• A company or organization intentionally uses that spelling.
• You’re following a style guide that specifies it.

Tips to Remember the Correct Choice

Here are two easy memory tricks.

Think About Jobs

Most English job titles end in -er.

Examples:

• Teacher
• Builder
• Painter
• Driver
• Adjuster

This makes adjuster feel more natural.

Remember the Industry Standard

If you’re talking about insurance claims, adjuster is almost always the correct choice.

Frequently Asked Questions

Which is correct: adjustor or adjuster?

Both spellings are correct, but adjuster is the preferred and much more common form in modern English.

Is adjustor a real word?

Yes. Adjustor is a legitimate English word, although it is used far less frequently than adjuster.

What is an insurance adjuster?

An insurance adjuster investigates claims, evaluates damage, determines coverage, and helps decide how much an insurance company should pay.

Is insurance adjustor wrong?

Not technically. However, insurance adjuster is the standard term used by most insurance companies, licensing agencies, and professionals.

Why is adjuster more common?

Over time, English has favored the -er ending for many occupations and job titles. As a result, adjuster has become the dominant spelling.

Can I use adjustor in professional writing?

Yes, but unless you’re following a specific organization’s terminology, adjuster is generally recommended because readers are more familiar with it.

Do dictionaries recognize both spellings?

Yes. Most major dictionaries recognize both adjuster and adjustor, but they typically list adjuster as the primary or preferred spelling.

Conclusion

When comparing adjustor or adjuster, both spellings are technically correct, but adjuster is the preferred choice in modern English. It is the spelling most commonly used in professional writing, business communication, and especially within the insurance industry. While adjustor remains an accepted variant, it appears far less frequently and is usually limited to certain technical documents, legal texts, or official names.

If you’re writing about an insurance adjuster, filing a claim, or creating content for a broad audience, using adjuster will make your writing clearer, more consistent, and aligned with current English usage. Knowing the difference between adjuster or adjustor helps ensure your communication is accurate, professional, and easy for readers to understand.