Advisor and adviser are two accepted spelling variants of the same noun. They have the same meaning (someone who gives advice about a subject) and are pronounced the same.
Adviser is the older and more frequently used spelling, but it may be considered less formal in some contexts.
Advisor is used less frequently than “adviser.” It generally indicates an official (job) position and is more commonly used in US English than UK English.
Examples: Advisor vs adviser
My financial advisor helped me create an investment plan for my retirement.
The academic advisor helped the students select their courses.
The legal adviser reviewed the contract carefully.
She sought the counsel of an adviser before making a major career decision.
If you’re following the AP Stylebook, you should use adviser. It’s the only correct spelling according to their guidelines. However, other language authorities, such as Merriam-Webster, accept both spellings. It’s important to use one spelling consistently in your writing.
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